Cut-and-Paste Translation / Executive Meddling: Upon hearing their debut self-titled album, the suits at their American record label decided it had too much filler, and decided to remove 5 songs and replace them with some of the band's British singles like "Complete Control" and "White Man in Hammersmith Palias". It is almost universally agreed by critics that this actually vastly improved the album, though some also note that adding in the mostly mid-tempo and more polished singles dilutes the UK version's Three Chords and the Truth feel a bit.
What makes this hugely ironic is that the song "Complete Control" is about just that kind of record company nonsense, something that the label clearly missed.
Doing It for the Art: The band wanted to provide more music for the fan's money, so they asked the CBS record label to sell the double LP London Calling and the triple LP Sandinista! for the price of just one LP. In both cases, CBS balked, but the Clash managed to make the low price happen anyway. In the case of London Calling, they talked CBS into letting them release an LP with a free 12 inch single included—then, they pressed an entire second LP instead of the single before CBS realized what they were doing. There are conflicting accounts of Sandinista!'s pressing: some sources say they repeated the London Calling trick, but others (including Joe Strummer himself) say the Clash simply compromised with CBS and surrendered the royalties from the first 200,000 copies sold.
He Also Did: After Mick Jones left the band, he joined the band General Public (but left shortly after they recorded their first album) and then formed Big Audio Dynamite, one of the more notable early Alternative Rock artists.
Strummer: On the spur of the moment I said 'I'm going to do the backing vocals in Spanish,'...We needed a translator so Eddie Garcia, the tape operator, called his mother in Brooklyn Heights and read her the lyrics over the phone and she translated them. But Eddie and his mum are Ecuadorian, so it's Ecuadorian Spanish that me and Joe Ely are singing on the backing vocals.
This is why a watch alarm can be heard in the second verse of "Rock The Casbah". Topper Headon's Dukes of Hazzard watch had accidentally went off, but the digitized version of the General Lee's horn matched the beat nicely, so they kept it in.