The Assistant District Attorney asks Sonny on direct examination if he cited Juan Ruiz for impeding traffic on September 14th, which Sonny confirms. However, when Sonny issued the parking ticket, it was dated March 30th, 1991.
According to Homicide file no. 199144 in the station computer, Marie Bonds' date of birth is 3/15/55, but in the game manual (the notes section) it is handwritten "4/20 Marie's birthday". In the former game Police Quest II: The Vengeance, Marie's Vice record indicates that her date of birth is 2/14/53.
According to Sonny Bonds' Personnel file in the station computer, his date of birth is 6/30/58, but according to his Personnel file in the former game Police Quest II: The Vengeance, his date of birth is 10/30/52.
Looking around outside the Coroner's Office will open a narration text indicating it's an ordinary "summer afternoon in Lytton", but the case data establishes the game's events in late March, which is spring, in the United States.
The goof item below may give away important plot points.
After discovering the cocaine in Morales' locker, Sonny informs Captain Tate he has reasonable suspicion she's in league with the cult and is told internal affairs will keep an eye on her. Although Sonny made a warrantless search of her locker, it was valid because the cocaine was evanescent evidence (it was at risk of being destroyed or disappearing before a warrant could be obtained). The locker search should have been enough probable cause to have Morales arrested for tampering with evidence rather than simply tracked.
Sonny uses his handcuffs on a water pipe to secure Carla Reed's shopping cart and possessions from being stolen while she interviews at the station, but this wouldn't stop someone from stealing her things inside the cart.