Character mistake: When the gang split up to look for the missing Billie and Tiger, Scooper says "me and Sticks will look up here" and goes upstairs but Sticks goes with Brains to search the ground floor - it's Spring that goes upstairs with Scooper.
Continuity mistake: When the gang first arrive at the stately home Albert parks his car next to a coach. When the camera angle changes the car has moved back a few yards, and when the gang leave the car has changed position completely.