From Roland Smeenk, "Attached you will find a large set of small typo fixes (mainly in the comments)."

src/osgGA/DriveManipulator.cpp

@@ -552,7 +552,7 @@ bool DriveManipulator::calcMovement()
 #endif
 
 #if defined(ABOSULTE_PITCH)
-    // abosolute pitch
+    // absolute pitch
     double dy = _ga_t0->getYnormalized();
     _pitch = -dy*0.5;
 #elif defined(INCREMENTAL_PITCH)

src/osgGA/TerrainManipulator.cpp

@@ -340,7 +340,7 @@ void TerrainManipulator::computePosition(const osg::Vec3d& eye,const osg::Vec3d&
             !hitFound && i<2;
             ++i, endPoint = farPosition)
         {
-            // compute the itersection with the scene.
+            // compute the intersection with the scene.
             osgUtil::IntersectVisitor iv;
             iv.setTraversalMask(_intersectTraversalMask);
 
@@ -367,7 +367,7 @@ void TerrainManipulator::computePosition(const osg::Vec3d& eye,const osg::Vec3d&
         }
     }
 
-    // note LookAt = inv(CF)*inv(RM)*inv(T) which is equivilant to:
+    // note LookAt = inv(CF)*inv(RM)*inv(T) which is equivalent to:
     // inv(R) = CF*LookAt.
 
     osg::Matrixd rotation_matrix = osg::Matrixd::lookAt(eye,center,up);
@@ -480,7 +480,7 @@ bool TerrainManipulator::calcMovement()
 
         _center += dv;
 
-        // need to recompute the itersection point along the look vector.
+        // need to recompute the intersection point along the look vector.
         
         if (_node.valid())
         {