Some have argued fans should be able to express their enjoyment as they like, while others say singing ruins other people's experiences.
Johnson, however, made his views on cinema etiquette clear.
“Sing! You’ve paid your hard earned money for a ticket, and you've gone into a musical, and you’re into it. Sing," he said.
Johnson, a 52-year-old ex-wrestler, voices the part of gregarious demigod Maui in the animation.
When asked about the similarities between the two roles, he said there is a clear difference.
“Maui [is] actually is a demigod," he said.
"The difference is wrestlers think that they’re demigods, but they’re not. I know that because I was one of them," he said with a laugh.
Johnson, who is also starring as Maui in the upcoming live-action Moana remake, said that his three daughters "love" seeing him take on the role.
"Because they see themselves in Moana, they feel they’re represented and they feel a sense of representation from the film too," he said.
Cravalho, meanwhile, said that when she was cast as Moana, she "never could have expected... just how impactful this character would be".
"I knew it would change my life, but it seems to have also changed many other people’s lives as well," she said.
"So sometimes when I meet kids who are at that really special age, I feel like Santa, where they look at me and say, 'You’re Moana!' And they believe it! And it warms my heart.”
Many fans of the film, who were children when the original was released eight years ago, will now be teenagers or adults.
Disney will therefore be hoping the film appeals both to the nostalgia audience as well as a new generation of children.
But it faces tough competition, coming just days after Wicked was released.
The original Moana made $687m (£540m) at the box office worldwide, and scored two Oscar nominations.
It was the most streamed movie of 2023 in the US, according to Disney.
A sequel was previously in development as a Disney+ series, but the company surprised fans in February when it revealed it would take the film to cinemas instead.
Songwriter Lin-Manuel Miranda - who was nominated for an Oscar for the original - has not returned to work on the music for the sequel.
Instead, the songs have been created by four composers, including songwriting duo Abigail Barlow and Emily Bear, who rose to fame in 2022 after creating an unofficial Bridgerton musical on TikTok.
Moana 2 is in UK cinemas on 29 November.