Raiders of the Lost Ark happens in 1936.
The first Type VIIA's weren't commissioned until August 1936.
If we are to assume that the introductory part happened over summer break, and that the subsequent hunt for the Ark started after the Fall Semester had started, it *STILL* wouldn't have been possible for a Type VIIA to be in the Indian Ocean: They would still have been in "work up", or crew training and defect correction, for several months in the Baltic.
And don't get me started about Nazi's carrying MP-38's in 1936.
Or the flying wing when the Horten brothers were still just building gliders.
Or the Panzerfaust (which I swear is actually an RPG, but it's been a while since I saw the movie) which wasn't invented until 1943.
Or (insert some random anachronism here).
ON EDIT: It actually is an RPG-2:
