diff --git a/opm/core/pressure/CompressibleTpfa.cpp b/opm/core/pressure/CompressibleTpfa.cpp
index 67d3a651a..954e07fa4 100644
--- a/opm/core/pressure/CompressibleTpfa.cpp
+++ b/opm/core/pressure/CompressibleTpfa.cpp
@@ -504,13 +504,13 @@ namespace Opm
         cq.phasemobf = &face_phasemob_[0];
         cq.voldiscr = &cell_voldisc_[0];
         int was_adjusted = 0;
-        if (rock_comp_props_ == NULL || !rock_comp_props_->isActive()) {
-            was_adjusted = 
+        if (! (rock_comp_props_ && rock_comp_props_->isActive())) {
+            was_adjusted =
                 cfs_tpfa_res_assemble(gg, dt, &forces, z, &cq, &trans_[0],
                                       &face_gravcap_[0], cell_press, well_bhp,
                                       &porevol_[0], h_);
         } else {
-            was_adjusted = 
+            was_adjusted =
                 cfs_tpfa_res_comprock_assemble(gg, dt, &forces, z, &cq, &trans_[0],
                                                &face_gravcap_[0], cell_press, well_bhp,
                                                &porevol_[0], &initial_porevol_[0],
diff --git a/opm/core/pressure/CompressibleTpfa.hpp b/opm/core/pressure/CompressibleTpfa.hpp
index 9fc5c43fd..054ac2e4f 100644
--- a/opm/core/pressure/CompressibleTpfa.hpp
+++ b/opm/core/pressure/CompressibleTpfa.hpp
@@ -61,7 +61,7 @@ namespace Opm
         ///                                   and completions does not change during the
         ///                                   run. However, controls (only) are allowed
         ///                                   to change.
-	CompressibleTpfa(const UnstructuredGrid& grid,
+        CompressibleTpfa(const UnstructuredGrid& grid,
                          const BlackoilPropertiesInterface& props,
                          const RockCompressibility* rock_comp_props,
                          const LinearSolverInterface& linsolver,
@@ -71,8 +71,8 @@ namespace Opm
                          const double* gravity,
                          const Wells* wells);
 
-	/// Destructor.
-	~CompressibleTpfa();
+        /// Destructor.
+        ~CompressibleTpfa();
 
         /// Solve the pressure equation by Newton-Raphson scheme.
         /// May throw an exception if the number of iterations
@@ -112,11 +112,11 @@ namespace Opm
         void solveIncrement();
         double residualNorm() const;
         double incrementNorm() const;
-	void computeResults(BlackoilState& state,
+        void computeResults(BlackoilState& state,
                             WellState& well_state) const;
 
         // ------ Data that will remain unmodified after construction. ------
-	const UnstructuredGrid& grid_;
+        const UnstructuredGrid& grid_;
         const BlackoilPropertiesInterface& props_;
         const RockCompressibility* rock_comp_props_;
         const LinearSolverInterface& linsolver_;
@@ -125,12 +125,12 @@ namespace Opm
         const int maxiter_;
         const double* gravity_; // May be NULL
         const Wells* wells_;    // May be NULL, outside may modify controls (only) between calls to solve().
-	std::vector<double> htrans_;
-	std::vector<double> trans_ ;
+        std::vector<double> htrans_;
+        std::vector<double> trans_ ;
         std::vector<int> allcells_;
 
         // ------ Internal data for the cfs_tpfa_res solver. ------
-	struct cfs_tpfa_res_data* h_;
+        struct cfs_tpfa_res_data* h_;
 
         // ------ Data that will be modified for every solve. ------
         std::vector<double> wellperf_gpot_;
diff --git a/opm/core/transport/reorder/TransportModelCompressibleTwophase.cpp b/opm/core/transport/reorder/TransportModelCompressibleTwophase.cpp
index c2d503275..697f94a57 100644
--- a/opm/core/transport/reorder/TransportModelCompressibleTwophase.cpp
+++ b/opm/core/transport/reorder/TransportModelCompressibleTwophase.cpp
@@ -96,7 +96,7 @@ namespace Opm
         props_.viscosity(props_.numCells(), pressure, NULL, &allcells_[0], &visc_[0], NULL);
         props_.matrix(props_.numCells(), pressure, NULL, &allcells_[0], &A_[0], NULL);
 
-        // Check non-miscibility requirement (only done for first cell).
+        // Check immiscibility requirement (only done for first cell).
         if (A_[1] != 0.0 || A_[2] != 0.0) {
             THROW("TransportModelCompressibleTwophase requires a property object without miscibility.");
         }
diff --git a/opm/core/transport/reorder/TransportModelTwophase.hpp b/opm/core/transport/reorder/TransportModelTwophase.hpp
index 3630ada8f..97386c8af 100644
--- a/opm/core/transport/reorder/TransportModelTwophase.hpp
+++ b/opm/core/transport/reorder/TransportModelTwophase.hpp
@@ -76,7 +76,7 @@ namespace Opm
                           std::vector<double>& saturation);
 
         //// Return the number of iterations used by the reordering solver.
-        //// \param[out] vector of iteration per cell
+        //// \return vector of iteration per cell
         const std::vector<int>& getReorderIterations() const;
 
     private:
diff --git a/opm/core/utility/miscUtilitiesBlackoil.cpp b/opm/core/utility/miscUtilitiesBlackoil.cpp
index 548aaa23a..6f4f75565 100644
--- a/opm/core/utility/miscUtilitiesBlackoil.cpp
+++ b/opm/core/utility/miscUtilitiesBlackoil.cpp
@@ -243,9 +243,9 @@ namespace Opm
         // matrix data.
         std::fill(surfacevol, surfacevol + n*np, 0.0);
         for (int i = 0; i < n; ++i) {
-            for (int row = 0; row < np; ++row) {
-                for (int col = 0; col < np; ++col) {
-                    surfacevol[i*np + row] += A[i*np*np + row*np + col] * saturation[i*np + col];
+            for (int col = 0; col < np; ++col) {
+                for (int row = 0; row < np; ++row) {
+                    surfacevol[i*np + row] += A[i*np*np + row + col*np] * saturation[i*np + col];
                 }
             }
         }