Trains are mentioned a bit too much
I loved how with the first film, thr concept of trainspotting was pretty random. In T2, they have Renton gazing from a train window, put trains all over the walls of his old bedroom, have a flashback at a disused station where a tramp asks them if theyre train spotting, have endless train sounds and headlights flashing by the windows in some scenes, then elongate Rentons bedroom into a ridiculously long train carriage.
I think I preferred the random approach, to being beaten over the head with a metaphor.