- Sleep only lasts for 1 round I believe? (While its 1 min in the PHB). But most spells have duration changed. Shield of faith for example lasts until rest I believe (10 min in the PHB).
- Rogues have no expertise.
- Arrows create surfaces.
- Fighters get a fighting style at lvl 2 instead of at lvl 1.
- You can only have 1 short rest between long rests. In the TTRPG there is no such limitation.
- The help action immediately gives someone 1hp. Originally you need a Medicine check of 10 to stabilize them, and they 1hp after 1d4 hours.
- Shove as a bonus action for everyone.
- Disengage as a bonus action for everyone.

Those are the unlisted changes on top of my head.