How does that little orphan they found on the streets (I think his name might have been Lukas) know a Hebrew prayer?
How can Josef Mengele reference Jurassic Park, if that movie is released 4 years later after this one?
The development crew must have heard it was in production. Or they were spoofing the book. It was the joke about the fat nerd Nazi shutting down the power, right? The movie's not too different from the book, so they could do that scene alright.
How did that guy do that thing?
It's difficult to explain in text, but perfectly possible as shown by a professional stunt man here◊. Click the "Next" button for a step-by-step breakdown that actually references the movie.