The players on $ale of the Century not seeing their own scores or the speed round clock. Outside of extreme cases, it meant that the everybody would still keep earnestly trying for questions until the very end. And the players not knowing they were in the final seconds meant there weren't as many crazy hail mary tries from players in last place (i.e. buzzing in on just the words "Which U.S. state" in order to try to catch up). This wasn't something they changed during the run, AFAIK, but it's something I didn't appreciate until I played the game at home with everybody seeing everything.
More to your specific example, Password Plus took quite awhile to figure out how to order their words. Earlier episodes would do things like FELIX-OSCAR-MISMATCHED-PAIR-PLAY, instead of something more interesting like MISMATCHED-PAIR-OSCAR-FELIX-PLAY, which got better passwords out sooner, and kept the subject of the puzzle in doubt until later. Perhaps it was deliberate, but I preferred the latter to the former. Super Password perhaps OVER-corrected this, but I liked seeing more Password play with uncommon words over quick-and-obvious puzzle solves.
-Jason