I just finished reading Skios, a farcical novel by Michael Frayn. There were some laugh-out-loud moments throughout, but I wasn't super jazzed to be reading the book until near the end, when it seemed like there was going to be a huge comedic payoff during which all the various plot threads would be sorted out and the characters would get their comeuppances or rewards. The conclusion wasn't awful, but it left me a bit unsatisfied.
Anyhow, the main reason I'm mentioning the novel is to point out the missing, necessary, second you in the first sentence in the photo above. Maybe the sentence had correctly said "told you you were" at some point, and a misguided copy editor or proofreader took out a you because the editing software had flagged the duplicated word.
The first you indicates whom the taxi driver told something to, and the second you is an essential part of that something: "you were Oliver Fox."