Lindsey Buckingham shared in the liner notes:

This was directed at Stevie a little bit. There’s something we are still having to deal with as a band: ‘What’s important here? People thinking you’re cool or thinking you’re cool yourself?’ It’s more how you feel about yourself, isn’t it? This is a classic pitfall of the entertainment industry. It draws people to it who are looking for a Band-Aid to fix things that have happened in their lives. The celebrity culture we live in is a very Roman manifestation of something gone a little wrong with the value system. It doesn’t speak of substance; it only speaks of visibility. It’s about not buying into other people’s idea of you — that’s the important thing.

The guitar sound is just a Stratocaster; but I love using the [Variable Sound Oscillation]. I just slow the machine down, come up with a picking part like that, double or triple it and tweak the VSO on either side so that it’s slightly out of tune, and the whole thing comes out with all this phasing.

Lindsey Buckingham shared in the liner notes:

[“I Know I’m Not Wrong”] is a close relative to ‘Not That Funny’ and they share a lyric. ‘Here comes the night time/Looking for a little more.’ It’s a little joke — can you find the thread here? Like a repeating theme in a novel.

Rolling Stone named it the #25 greatest Fleetwood Mac song, saying:

Like many Tusk highlights, ‘Not That Funny’
began as a solo Buckingham experiment, down in his home studio. It has lyrics in common with Tusk‘s ‘I Know I’m Not Wrong,’ but it’s raunchier and rougher. ‘You have to allow yourself to get totally drawn into the music,’ he said in 1980. ‘Once you’re there, the hardest thing to do is let yourself do anything outside that. I’d come out of my basement studio after about six hours, and Carol, my girlfriend, would be sitting in the living room watching TV or something, and I just wouldn’t have much to say. My mind would be racing. I love it.’