The day of AJ's taped confession is 2-16-1999, the date the episode aired.
When Danny writes his name on his locker, he crosses out Bobby Simone's name. You can still see John Kelly's name, where it was previously crossed out by Bobby at the beginning of season two.
The incident in which Sinclair made Andy look like a "monkey "was in the pilot episode, in what was the very first scene of the entire series. It featured Andy on the witness stand, being examined and cross-examined by Sinclair and Sylvia, later Andy's wife.
Kim Delaney and Khandi Alexander also briefly worked together on CSI: Miami