Continuity mistake: As Frank and Tracy are walking across the pipes, there is a close-up shot of the pipe breaking in half as Tracy walks on it. However in the wide shot as Tracy falls, the pipe is intact and breaks again as Tracy falls on it.
Continuity mistake: The bus Frank has hijacked is bus 104, seen as it crashes through the obstacle. But when his bus pulls up behind the tour bus, this bus is also numbered 104. Then they pull up and stop behind 103.
When Frank and Tracy are about to surrender at the hotel and the cops start shooting, Frank yells "What the hell is going on here?" Frank then hides behind the car and you briefly can see the boom mike reflected in the car window.