|Source: The Tonight Show With Jimmy Fallon-|
The looks like a parody of Jim Morrison and The Doors performance on the Ed Sullivan Show in 1967. Except The Doors performed Light My Fire and When People Are Strange. They got the leather jacket and shirt right, as well as the boots and the black leather jeans look similar to what Jim Morrison wore for that performance as well.
But what they get wrong here is that performance that The Doors had on Ed Sullivan was one of their best ever. Jim Morrison and the band sounded as great as they ever had. Even if Ed Sullivan and company didn't like his use of the word higher in Light My Fire. It was sill one of his best performances ever. Jimmy Fallon just doesn't look like Jim Morrison. And unless you're simply not a fan of The Doors or even Morrison, I don't understand why someone would think this performance was funny.
There was plenty to make fun of Morrison and his performance here. The fact he goes on life stage on national TV on the biggest network with the biggest audience on the most popular show on the country at the time, with a boner sticking out of his skin-tight leather jeans. Maybe they could have had a cover doing that instead. The Ed Sullivan Show made sure that Morrison's boner was shown on national TV and shown multiple times.
Or they could've made fun of Ed Sullivan and his staff trying to get Morrison to drop the word higher from Light My Fire and made fun of censorship. Instead of Morrison's performance and trying to make him look some drunk singing Reading Rainbow with a 60s blues rock band.