The Goofs in the movie were deliberate
I really like this movie, yet the new computers, cell phone and San Diego cap that weren't around in 1991 were quite noticable to me. Then with the newer Arab song, the Chinese speaking in the wrong dialect and the East Germans speaking with the Hungarian accents (as others on this board noted) leaves me to conclude that all of these readily discernible "goofs" weren't goofs at all, but a spy game for you to play, just as Nathan Muir was training Bishop to spy.
Seeing that people on this board are taking all that stuff so seriously, it's a little surprising they didn't consider that the goofs were there to "find".