Andrew Garfield only told three people he was going to be in Spider-Man: No Way Home
The actor talked about playing Spider-Man again during an appearance on The Ellen DeGeneres Show

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Andrew Garfield did his best to keep his role in Spider-Man: No Way Home a secret. He lied to nearly everyone who asked, denying everything. But there there were three people (besides that delivery guy who spilled his findings on Twitter and, of course, Garfield’s agent) who were privy to Garfield returning to the big screen as Spider-Man.
The Tick, Tick…Boom! actor went on The Ellen DeGeneres Show where, in addition to being asked about his recent Golden Globes win and working with Lin-Manuel Miranda, he also discussed the arduous process of keeping the big MCU secret.