A page in Batman & Robin 7 has its speech bubbles reversed. Artist Cameron Stewart:
Well the annoying thing is, originally I had the panel facing the other way, but I was asked to flop it so that this precise thing would not happen. Somewhere along the way there was a mixup and it happened anyway. GRRRR
The issue is, otherwise, fantastic. Bleeding Cool has a “British Glossary” of all the slang and locations in the book. The funny thing is, I’ve only been to London once, but it all felt familiar to me. (via)
Also, check out these two videos by Stewart that show his inking process.