There are a lot of freeze-frames in T2 Trainspotting.
T2 is about a group of immature men coming to grips with the fact that they are getting older.
T2 Trainspotting is about that tension, both in the lives of these men and in the wider movie industry, which is increasingly consumed with rehashing its glory days over and over.
In dialogue scenes, in fight sequences, in introspective moments, the film will suddenly stop and then resume a moment later.