Dylan O'Brien had to wear a fake mustache to play Dan Aykroyd because their 'hair follicles didn't match'

"It was always coming off and getting in my mouth," the actor says of his "Saturday Night" facial hair.

Sony Dylan O'Brien as Dan Aykroyd in 'Saturday Night'

Sony

Dylan O'Brien as Dan Aykroyd in 'Saturday Night'

Dylan O'Brien's onscreen looks have only gotten hairier since his Teen Wolf days, but all his mustaches were not created equal.

While promoting his new film Twinless at the Sundance Film Festival alongside director and costar James Sweeney, the actor reflected on the differences between two of his recent screen 'staches in a conversation with Entertainment Weekly.

"We shot [Twinless] before Saturday Night, and that was not my mustache — that was a fake one," O'Brien said of the Saturday Night Live biopic. "They made me wear a fake one for Aykroyd because they said my hair follicles didn't match Dan Aykroyd's."

Related: Dylan O'Brien doesn't remember if he met Dan Aykroyd before playing him in Saturday Night

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O'Brien's Twinless mustache, however, was 100 percent real. "This was mine," he explained. When asked if he preferred sporting his own facial hair rather than a fake mustache, O'Brien admitted, "I'm a little biased, but yeah. Also, wearing a fake mustache every day when it's humid in Georgia in the late summer —"

Sweeney jumped in with a question: "Did you have to shave to keep it stuck?"

"Yeah, always," O'Brien confirmed. "And it was always coming off and getting in my mouth and stuff. Whatever, I can't complain. It was an easy, great job."

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Shortly before Saturday Night hit theaters last October, O'Brien told EW that he had his doubts about his physical resemblance to the Ghostbusters actor — or any other original SNL cast member, for that matter.

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"I just felt like I didn't fit Aykroyd nor Chevy Chase, so I didn't even send the [audition] tape in," he said. "I guess I thought that I didn't really resemble him, which isn't a huge deal, but then I was seeing all the casting announcements, and I was like, 'Wait, what the f---? Everybody totally looks like their person.'"

Related: Saturday Night star Cory Michael Smith reveals why he didn't meet the real Chevy Chase before playing him

Neilson Barnard/Getty  Dylan O'Brien at the 'Twinless' premiere at Sundance

Neilson Barnard/Getty

Dylan O'Brien at the 'Twinless' premiere at Sundance

O'Brien also previously told EW that he was drawn to Twinless — in which he plays a character mourning the loss of his twin brother — because he was intrigued by the dynamic between twins. "I'm fascinated by it in terms of it being something so unique on this earth," he said in an interview. "That is one of those things that really, unless you experience it, you can't understand."

He continued, "Twinless support groups exist because it is a very specific loss and trauma that you need support with — losing a connectivity that us normies can't ever quite understand. That deeply resonated with me, even though I don't have a twin. I found it to be a really compelling and heart-wrenching center to this story. This tragically poignant tale of this kid losing his other half."

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Related: Saturday Night's Lamorne Morris explains Garrett Morris' climactic (and improvised!) 'Kill All the Whities' song

The actor was also impressed by the film's screenplay, which Sweeney wrote. "The script was so fantastic and dialed in from the time I first read it," O'Brien said. "I authentically connected to it all. It was one of those wonderful creative experiences."

Additional reporting by Calie Schepp.

Read the original article on Entertainment Weekly