When MacGruber leaves the cemetery and sees the gray Neon in the parking lot, he starts breaking the windows while talking on the cellphone. He breaks both driver's side windows, then the rear window. The shot cuts to the Colonel with whom he is speaking. When the shot returns to MacGruber, he again breaks both driver's side windows - the rear window is still intact.
When Jeff throws MacGruber out of Cunth's gambling room and then break's Macgruber's Blaupunkt, it is undamaged when Jeff bangs it against the window frame. But when he throws it next to MacGruber it is prominently damaged, with the housing bent way out of shape.
The goof item below may give away important plot points.
After Jeff the henchman is shot in the head (and his brains etc is splattered onto a canvas) he falls onto the floor with the back of his head towards the camera - without a mark on it (no hole, no blood, no nothing).