When the family is on holiday in Brighton you can clearly see the rides on Brighton Pier including 'Ranger' and 'Turbo Coaster', these rides were not introduced until the early-mid 1990's.
The credits misspell the surname of the main character, Bernie, as "Reubens" instead of "Rubens", the spelling that appears several times within the film itself. His parents (Esther and Manny), as well as his grandfather (Mr. Rubens Snr), are all correctly listed with the "Rubens" spelling.