I'm new to Blender and I had been having some problems with animating. I animated the door at the start and then I went forward about 30-40 frames I then started animating the door again. When I play the animation, there were movements between the start and the end of the both animation even though there were not any frames in between.
Look at the 'Door:Wood' section on the dope sheet and you can see there is blanks between the 4 frames and yet the door is moving during the blank space.