Acceptable Targets: While the episode was pretty well-received, some fans and a few critics argued that it treated nerds (and more specifically, Trekkies) as Acceptable Targets. However, the majority opinion is that it attacked only one unfortunate kind of nerd: the entitled, rude sort that uses their online persona to bully others and compensate for real-life frustrations.
Alternate Character Interpretation: How much of a jerk is Walton? He comes off as kind of a douche, Lowry warns Nanette that he's a 'player', and it's implied that he exploited Daly in the early days of Callister. But otherwise his collegues seem to like him, there's no hint that he's married (or is still married) so being a player is hardly a strike against him, he genuinely loves his young son, and there's serious nobility in him due to his Heroic Sacrifice.
He's also probably Daly's friend, he certainly sees himself as one, because they started the company together and still work together, apparently quite effectively. We only see them interact in real life in two scenes: in one, he's trying to get Daly to be more assertive in his role, and in the other, he yells at Daly for delaying a crucial update after they'd specifically discussed its importance. Both are very reasonable responses in context. We'll never know what would happen if Daly objected to his behavior because the guy never speaks up. Walton's probably a pretty decent guy all-around, but the narrative is (initially) skewed to Daly-vision.
Critical Research Failure: While the tech featured in Black Mirror has never been hard sci-fi, it usually tries to stay somewhat within the realm of possibility. In this episode, however, Daly possesses a machine that can reproduce someone's personality and memories from their D.N.A., which is... not how D.N.A. works.
To say nothing of the ending where A group of AI are able to move into a 3D representation of a patch in their game world where the network firewall "detects the mod" they're using as a virus and strips *only that part of the program* away, then deposits the AI into a compatible program on the cloud as whole, equivalent objects. Even if the Network technology of the future has evolved to a point where that would be feasible, Infinity's network security must be abysmal if it's patching system essentially allows code injection from client users.
Esoteric Happy Ending: As noted on the main page entry, Only the Leads Get a Happy Ending. But even setting aside the problems of their real life counterparts, the crew are still stuck forever in a created universe populated by G.I.F.T.-afflicted douchebags like Gamer691. The rules of their new existence free from Daly's mod, such as whether they're now capable of dying permanently, are also left unclear. Downplayed, in that none of those same douchebags have nearly as much power as Daly did and, as shown, the crew can just leave if things get threatening.
Another implication bordering on Fridge Horror is that the lead designer and key figure of the company that made the Infinty game is dead, which makes the in-universe future of Infinity very uncertain. Even without that in mind, how long would it take for the game to be inevitably rewritten or shut down, erasing the whole crew from existence in the process?
Hilarious in Hindsight: Nanette mistakenly calls Daly's favorite show Space Force. Months later, in real life, President Donald Trump proposed a new branch of the United States military which he called the "Space Force".
Walton's Heroic Sacrifice, which ultimately dooms Daly, coupled with Walton telling Daly to 'fuck himself to death'.
The ending, with the surviving crew members flying through space and ready to have the time of their lives away from Daly.
Narm Charm: The whole "stealing my pussy is a red line" thing was utterly hilarious, but then wouldn't you be upset if you could no longer pee, poop, or masturbate? Also maybe justified by Nanette's subconscious forcing Skewed Priorities on her as a coping mechanism for her nightmarish situation.
One-Scene Wonder: A hilarious cameo by Aaron Paul as a Jerkass player who thinks the newly freed ship is just more players screwing him around in an attempt to trade resources.
Tear Jerker: Walton's tragic revelation of how Daly broke him: he was forced to watch the death of his six-year-old son. The reason he seems so gung-ho about playing the coward to Daly's hero in Infinity is out of fear that Daly will do so again, in increasingly sadistic ways.
The Woobie: Anyone trapped in Daly's Infinity mod.