An officially licensed 1986 Japanese toy of Bowser holding Mario on a spring has a very unfortunate design issue with the placement of the nub to hold Mario in the spring. The spring appears to be attached to a normally unseen part of Mario's anatomy.
This in-store display for a 2019 line of official Mario clothing is possibly the most inaccurate Super Mario Bros. artwork ever used in an official capacity. Nearly every element of the image is either wrongly sized, misaligned, or placed in a nonsensical manner.