The slogan printed on Tom's t-shirt in the final scene is an in-joke making reference to the fact that the show is based on a book.
The search of a student at the start of the prom scene finds them having a bottle of "mouthwash" and the searcher says give it here you think I have never met a teenager before. This is what is said when Alex enters Point Blanc and they find a bottle of "mouthwash" in his bag.
When Yassen looks at Alex's school profile his ID is listed as 15R001. The '001' may be intended to mimic James Bond's famous agent number '007'. Additionally, his class is listed as '11DRB-X Band', this would indicate that Alex is in Year 11 at school and therefore is 16-17 years old. In the books he is age 14.