Dick Tracy has a strange relationship with this trope. The strip began as a somewhat normal action packed police procedural comic, then it went Off-Model in a good way when it began presenting its villains as severely Gonky killers with even stranger plots and abilities. Then, in the mid sixties, it went Off-Model in a bad way with the introduction of science fiction technology, lazier art styles and villains that just weren't up to par with the originals. Then, when Max Allan Collins took over, it once again rose in popularity and art style, but then the time period between late 1993 and early 2011 were disastrous for the detective. Now, two writers have once again brought it back up to its previous peaks of popularity, and it's unsure what's going to happen from this point on.
Charles Schulz's simplified style confused some printers at first, leading to "corrections" that were more usually the opposite - erasing a character's eye after mistaking it for a misplaced ink blot, for example.
A strip of Prickly City had a glaring miscoloration that made the punchline hard to understand. The strip ended with Winslow being beat up between panels, but in the final panel, his color palette has been switched with that of Carmen. You can tell it's Winslow because he has a snout and tail.
This happens a lot in colorized strips. Full-color strips Monday-thru-Saturday are still a novelty that only some papers bother with, so for the most part these strips are produced only in black and white just like in the old days, and the colorization is farmed out by the syndicate. It's not publicly known who they farm it out to, but there's strong support for the theory that English is not their native language. Exceptions mainly include big-name strips that are already produced by entire studios, and Non Sequitur, which is not colorized at all at the artist's insistence.
From about September 2000◊ to January 2001◊, the art on Garfield was very jagged and angular, particularly Garfield's face. This could've been due to a new inker or penciler taking over and not being as familiar with the "house" style.
Pearls Before Swine also parodied this once, in which the colorist deliberately colored the last panel wrong to be an ass to Stephen Pastis.
When Greg Howard handed off illustrating the American Sally Forth comic to Craig Macintosh (Howard kept writing for a while), readers protested that the new artist made the characters too thin. Macintosh began emulating the original style soon after.
Bill Mauldin once had Willie and Joe, the heroes of 'Up Front' being confronted by a superior while both were drunk. As Mauldin ruefully noted, some of his readers wondered if her was drunk too, as three characters had seven hands.