Errors in geography: The street sign partly visible in the initial establishing shot of the theatre (seen at the start of "Pilot", et al) reads "6100 Sunset". This is nearly three miles east of the actual Sunset Strip, roughly 8200 to 9200 Sunset Boulevard.
Continuity: In many episodes the countdown clock in Matt's office jumps back and forth. Also, in many cases, after doing some math, it is obvious the clock is not accurate.