Although the boys' holiday is set in Malia, Crete (Greece), the majority of external filming took place in Magaluf, Majorca (Spain) --- with any signs mentioning the true location covered up, removed or replaced.
James Buckley, who played Jay; was 23 years old when the film was made. He was the youngest of the quartet who played 18-year-old school leavers. He was also the first to marry and have children.
When the parents are saying their goodbyes, if you look closely, Simon's yellow Fiat Cinquecento from the TV series can be spotted in the background, with a plastic back over the back window, which was smashed in the last episode of Season 3.
Originally, Mark Donovan who bullied the Inbetweeners in the TV series, was to have a larger role in the film where he would follow the lads to Malia, but the writers couldn't fit it into the script so the idea was scrapped.