The live comedy broadcast has been subject to technical issues with some struggling to hear what’s being said.
Some segments have featured muffled audio, while the studio appears to have significant levels of background noise.
Scott Mills and Chris Stark’s Innuendo Bingo also struggled in the tech department during the show.
The duo's comedy bit was plagued by squeaking microphone feedback and echoing noises.
Viewers took to Twitter to share their sound woes, with one claiming the show “sounds like they’re under water”.
Another said “they might need to get some sound guys in” to fix the problems.
.@comicrelief What is happening with the sound on the show tonight? Sounds like they're under water. sort it out.— (((Mark Poulson)))❄️ (@poulsm90) March 24, 2017
Think they might need to get some sound guys in on Comic Relief? Just me, sounds 'orrid.— Sharpy (@Surf_Photo) March 24, 2017
What is up with the production quality of comic relief. Sound is terrible— Chris Palmer (@ChrisPalmer099) March 24, 2017
What's with #ComicRelief? Awful sound and feels very clunky and unorganised— Rowan Charlton (@RowanCharlton) March 24, 2017
#comicrelief sound levels awful. Come on you guys are better than this.— Bob Price (@Huxleypiguk) March 24, 2017
I know it's for charity...& I will happily donate, but what the heck is going on with the sound on #comicrelief ?!— Beth Alston (@BethanyAlston) March 24, 2017
The BBC declined to comment, though a spokesperson said: "It's a live studio environment and feedback for the show is fantastic."
This year’s charity special is being broadcast from The O2 in London.
The show’s opening number saw Ed Balls reprise his Gangnam Style routine as part of a La La Land inspired dance number, with comedians including Warwick Davis, Lenny Henry, Greg Davies, Miranda Hart and more taking part.
The evening will also see the long-awaited Love Actually ‘sequel’ from Richard Curtis.
The short is bringing back plenty of the original cast, and will catch up with the rom-com characters 13 years after the end of the film.
BBC One, 7pm