The 25-year-old, who plays the legendary Peter Parker in the upcoming flick, couldn't believe that a scene from the teaser, which showed a brief clip of the Green Goblin (played by Willem Dafoe) return, was shown.
Whilst watching the footage with his co-stars Zendaya and Jacob Batalon, Holland says: "I love this part. People are going to lose their minds.
"Oh!" the actor suddenly says when the Green Goblin's presence is first hinted, "they show it!"
"Oh they show it," Zendaya adds.
Clearly, Holland didn't expect the newly deprived Green Goblin to be revealed to fans this early.
The cast was also loving an outfit change for Spidey, who looked pretty cool in an all-black, almost venom-like look.
Jacob Batalon shouts: "No way!
"Your suit was crazy in that one."
Some of the other confirmed cast members are Alfred Molina as Doctor Octopus and Jamie Foxx reprising his role as Electro from The Amazing Spider-Man 2.
Of course, Benedict Cumberbatch is back as Dr Strange, who we last saw in Avengers: Endgame.
However, after spending six years as Spider-Man, it seems as if Holland may not stick with the role for much longer.
Speaking in an interview with GQ, he said: "Maybe it is time for me to move on. Maybe what's best for Spider-Man is that they do a Miles Morales film."
Holland continued: "I have to take Peter Parker into account as well, because he is an important part of my life...[but] If I'm playing Spider-Man after I'm 30, I've done something wrong.
"Since I got cast as Spider-Man, I haven't really taken a break.
"I find myself ringing my dad [Dominic, a comedian and author] for stuff that I should definitely know how to do: 'Dad, how do I put the washing machine on?'"
After the final few shots are done, some additional dialogue is recorded and the global tour is completed, Holland won't really have anything more to do for the film.
Speaking about that, he admitted: "It's very strange. The last six years of my life, I always had a job to go to. It's kind of terrifying, but it's also really exciting."
He'd be sticking around if it was anything to do with Spider-Man producer and former Sony chairperson Amy Pascal, though as she told the publication: "He's the hardest-working person that I know."
Spider-Man: No Way Home will be released in cinemas on Wednesday 15 December.
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