"I hated his Halloween costume," Johnson told ET's Kevin Frazier while promoting Jumanji: The Next Level in Cabo San Lucas, Mexico. "Where he had my fanny pack. I just didn't like the way he was standing."
"I nailed it," quipped Hart, asking, "Did you see the napkin under my elbow?"
For Halloween, Hart dressed up as his co-star's most iconic look, the one where The Rock wears jeans, a black turtleneck with a silver chain and fanny pack. Hart posted a side-by-side photo of the two, as well as made a video showing up to Johnson's home to trick-or-treat.
"Well, it's exactly how you stood," said Hart of Johnson's criticism.
"No, I stood cooler. I was like a G. You were like, you were a little, your hips were forward in an interesting way. I didn't understand," Johnson explained.
"All the choices you made that day were, they were all pretty bad," Hart teased, before sharing the story about the napkin that can be seen under his buddy's elbow.
"So on the day of the picture, that was a choice to put [the napkin] on there because he didn't wanna mess up his black shirt," Hart dished. "He didn't wanna get that turtleneck dirty, is what they say. That black turtleneck. So he put a napkin and took the picture."
"As a resourceful man would do, right?" added Johnson. "It was dirty. I put a little napkin here."
Meanwhile, in the Jumanji sequel the gang returns, but things have changed. As they attempt to rescue one of their own, the players will have to brave unknown territory, from arid deserts to snowy mountains, to escape the world's most dangerous game. This time around, Danny DeVito turns into Johnson and Danny Glover becomes Hart.
For Johnson, it was an "honor" to work alongside and portray DeVito in the film. "To really embody him and I think that, you know, with Kevin and I, those guys, they have a real relationship in real life of over 30 years," he explained. "So they grounded the movie at the top of the movie and Kevin and I were just able to come in and do what we did. We got really lucky to be able to embody two guys who have very distinct acting personalities and styles, and who are very yin and yang just like Kevin and I."
And while Johnson wasn't fond of Hart dressing up as him for Halloween, Glover was a big fan of Hart's impersonation of him.
"When I saw it, it wore me out, man! It had me at both, you know, Dwayne's portrayal of Danny and Kevin's portrayal of me, you know, I thought it was just right on," Glover told ET. "And they kept it kind of bitter bickering. The bickering between the two of us, you know, that was still alive and then everything else. So I thought it was wonderful, man."
Jumanji: The Next Level arrives in theaters on Dec. 13. See more in the video below.