When Cliff runs out of the hotel onto the sidewalk and looks up to see Vince about to jump from the window, the sidewalk is wet, having just rained. But when he quickly runs back into the hotel to save Vince, it's dry.
When Vince Grayson is ordered by Belknap to write his suicide note, he misspells Belknap as "Belnap", leaving out the "k".