Honorable Mentions:
- Inertial dampeners fail in both
- DM calls it “FTL drive” but it’s warp drive in all but name
- Subspace communications
- Both have mirror universes
- Discovery’s experimental spore drive is Dark Matter’s experimental “Blink” drive in all but name
Edit: Had one I meant to include but forgot: Killer Barrels
Bonus: Has Detmer and Sam Kirk too.
Honestly don’t know how you could forget dunking the cosmic doughnut but I guess we’re all just hanging on to pieces of what we’ve truly experienced.