When getting a room to meet Inga, Alan is told to go to room 319 - the number on the door is shown clearly as Renato enters. When Carpenter later breaks down the door, it clearly says 302.
The surname / last name of the character who calls herself ''Liz Simpson'' in the movie is billed as "Liz Sampson" during the closing credits. The role was played by actress Colleen Camp.
When Miss Post finds the film projector glued down, she asks if someone "other than I" can lift it. "Other than" counts as a preposition and should take "me".