Continuity mistake: In the bookmaker's apartment, while Roy. John, Marco and Chet are working on the bookie who's in full cardiac arrest, Vince walks in and speaks to Captain Stanley. Then Vince, who's wearing a watch and ring on his right arm/hand, reaches for all the ringing telephones, and one by one he removes the receivers from the bases, but the right arm/hand in the closeup has no ring or watch.
Continuity mistake: When Roy and Johnny are on the Coast Guard helicopter, responding to The Boat wreck with injuries off Catalina, there are a few interior shots of them that are flipped, while they're looking out the windows. The paramedic patches are on their left sleeves, but in the flipped shots the paramedic patches are on their right sleeves.
Continuity mistake: While 51 is breaking into the bookie's apartment, after Chet uses the axe on certain areas of the door he puts the axe down, and in the shot from inside the apartment Chet reaches in through the hole on the door to undo the chain and remove the bar, but when the door opens there's another new axe mark over the top lock that was not made by Chet.
Continuity mistake: After the bookmaker has had the heart attack, when Captain Stanley bangs on his door, the bookie pulls one of the four telephones onto the floor, and when Roy walks in it ends up lying on the floor between the defibrillator and drug box, leaving three phones on the table. However, in the closeup, when Vince places all the phone receivers onto the bases, there are four phones on the table, plus a notepad suddenly appears on the table, and there are fewer cigarette butts in the ashtray.