302: a couple of glitches (SPOILERS!)
 

Don't read this if you haven't played the game. This is a big SPOILER! Now you are warned:

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1. On the train, in the car with the moles and Jurgen, while listening to Nefertitis conversation with Jurgen, another Nefertiti pops out of the wall and goes back again, through the wall.

2. In the tomb, while standing on the outer side of the two doors, if you use the can of nuts, Sam and Max will reappear on the other side of the doors.