Continuity mistake: When they're all releasing the balloons the shot from behind shows no wind moving the balloons; a shot later from the front there's a very strong wind; but a shot later from a side angle there's now a mild breeze blowing.
Continuity mistake: When Judy wakes up with Steve, her left arm is either tucked under the sheet or on top of it, depending on the shot. This changes back and forth.
Continuity mistake: When Judy is watching Nick sign at the Carry On-oke an Asian guy with a striped shirt behind her appears / disappears between shots.