I think it's useful to build this list so SCS is aware of what aspects of Convoy we'd like to see improved. If you have noticed anything I haven't, please comment!
- Weather (rarely it is synced, most of the time it is on a big delay or doesn't sync at all)
- Parked trailers and vehicles in no-collision zones (and some parking zones)
- Traffic lights that are flashing yellow (these appear to be normal working traffic lights to others)
- Air horns (the sound does not play for anyone else in the convoy, it is only for you. Normal horn is synced fine.)
- In-game time (I expect this is supposed to be in sync but somehow it falls out of sync, especially when everyone teleports from different locations to the same one for a job to do together)