Favorite game by a player, all-time:
John Stockton, 1993-94 playoffs, Game 4 of the First Round vs. San Antonio, 4th quarter.
The Jazz scored 24 points in the 4th to win the game tied after 3. Stockton had 11 assists and one steal in the 4th quarter, to account for all 24 points (he didn't get an assist on the steal, since another pass was made afterward, but it was his steal that led to that basket).
Most incredible display of passing I've ever seen, and most dominant performance I've ever seen from a PASSER. Just plain amazing.
Single favorite play:
Bobby Jones, during the "Dr. J behind-the-basket" game in the 1980 Finals against the Lakers. Bobby Jones blocks Mark Landsberger's break-away basket by cutting in front of him, ducking underneath the basket to avoid hitting his head as he block the shot. Basically the Tayshaun Prince/Reggie Miller block, except that Jones outran everyone, cut IN FRONT of Landsberger, and blocked the shot while flying backward, ducking under the backboard.
Favorite single offensive play:
From the Stockton game above, Stockton throwing a kick-up bounce-pass to an empty spot on the court under the goal. Just as it looks like it's a ridiculous turnover, Tom Chambers comes from NOWHERE to catch the pass on the run, on its way up, for the score.
Favorite in-person play:
Bobby Jones steal falling out-of-bounds and saving the ball in-bounds for a fast break against Kansas City Kings in Kansas City in 1985. Kings' final year in Kansas City.
Favorite single offensive play in person:
Same KC/Philadelphia game: Moses Malone in the middle leading the fast break with Charles Barkley on the wing. One of the funniest things I've ever seen.