As it turns out, the Magic Eye picture in Mallrats is neither a sailboat or a schooner
Not like Kevin Smith really gave a shit, because he probably had “it’s a sailboat” written into the script long before some prop person picked up the Magic Eye poster, but in the scene in Mallrats where the character of Willem is spending hours trying to see the hidden image in the Magic Eye picture as everyone around him keeps saying “Oh, I see it! It’s a sailboat!”, it turns out… it’s not a sailboat.
Ta da. Mystery solved. I know you were worried and concerned.