Believe It Or Not, These Aren't Actually Design Flaws

Squares on the End of Toothpaste Tubes

Those colored squares aren't just a design feature, they're actually indicators of where the machine was meant to cut the pastic tubes in the factories. If those marks weren't there, the toothpaste would come out all in one tube. It's a common misconception that the color of those squares represented the ingredients in the product, but that isn't true.