When we first see McGrath's tattoo in sickbay, the numbers are "24 666 42." When McGrath shows the tattoo to Parker on the roof near the end of the episode, the numbers are "24 666 12."
During the gun battle in the launch bay, when Parker finally reaches the Sphere, he immediately flips down the visor on the helmet. In the next two shots of him on the monitor in the control room, the visor is up. Right before he engages the sphere, we see a monitor shot and the visor is back down.
Ramsey: Parker, this is a briefing – you're supposed to debrief us. Thus the term.
Frank: (in the middle of a shootout) Now I know how Butch and Sundance felt. Ramsey: No you don't. Butch and Sundance actually liked each other!
Donovan: Let me ask you a question, McGrath. Do I ever get to backstep? (McGrath just chuckles)
When McGrath is brought on the base, Talmadge says "Lets get him to sickbay". Robert Picardo who plays McGrath starred as The Doctor in the sickbay in Star Trek Voyager.
Dillon Moen takes on the role of Jimmy Parker, previously played by Roland Gibbons.
Emma Duncan (very briefly) takes on the role of Patricia Parker, who was played by Jenna Lyn Ward in the pilot and the first season episode "Vows."
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