Check the photos in the first post. You posted the first reply in that topic, but it's understandable that you might have forgotten it given that the topic was posted 5 years ago
When first discovered, the Red Sea Crossing cart had mis-registered red ink that was offset on the label from where it should have been.
There was controversy over this. Some thought it proved its originality by dating the printing process and related errors to that time period and reinforcing the idea of it being a limited, low-budget production. Others thought that the effect was easy to fake and proved nothing.
Then a new one turned up, without the mis-registered ink.
The comic strips about Red Sea Crossing had mis-registered ink. As the strips progressed, the effect got more pronounced. The last strip featured no mis-regisistration, so it implied that Artie was now playing the other cart.
But in the end, the ink had simply been mis-registered so far, it showed up later on a completely unrelated strip.