Other mistake: When the guys find out that they've passed the THC test, Jamal turns to Silas and asks if they're still high on the ivory. At the moment he asks, an elf walks across the room. This is supposed to be a figment of their imagination as they are high, so why does the woman at the desk watch the elf too? (00:14:45)
Suggested correction: It's supposed to be a joke, meaning she's high too.