Plot hole: It's stated multiple times that the Semper Apex server room is protected from wireless signals, but Sofia's team sneaks in and plants a "ghost jack" with a wireless transmitter on it, which they say is slaved to an IP address. Except that wouldn't work in the server room. There'd be no way to get a signal to or from it.
Elementary (2012)
1 mistake in All In
Starring: Lucy Liu, Aidan Quinn, Jonny Lee Miller, Jon Michael Hill
Incel: Who are they?
Sherlock: That's Homeland Security.
Incel: But...you promised you wouldn't tell them about me if I talked to you!
Sherlock: Yes, but you play den mother to a pack of would-be rapists and mass shooters, so you can see how lying to you would be the highlight of my day. Look on the bright side - you don't seem to enjoy the company of women, and that shouldn't be a problem for the next five to ten years.
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Chosen answer: M broke into the brownstone and left a note. Holmes deduced he was staying at a high-class hotel from the soap scent on the note, and gave a picture from a hidden camera to his "irregulars" on the street to stake out hotels. One of them saw him, so Holmes followed him to his next intended victim and knocked him unconscious with a baton.
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