Gary Simmons is card #176, and there are three different version of his OPC card. All three varieties picture Simmons in his California Seals jersey. The team would transfer to Cleveland and be known as the Barons to start the 1976-77 season. OPC tried to keep up with the change by using the Barons monicker across the top of the card and printing "Team transferred to Cleveland" on most of the new Barons cards. Just not for Simmons.
Around the same time, the Kansas City Scouts were moving to Colorado to become the Rockies. OPC noted those cards by printing "Team transferred to Colorado." Simmons got mixed up in all franchise changes taking place.
The card on the left is the most common corrected version with the transfer phrase removed. The card on the right is the earliest error version incorrectly denoting "Team Transferred to Colorado" on the front. The card in the middle is an even rarer version featuring a very poor attempt by OPC to airbrush (or smear) the error away.
A second error that needed to be corrected in the 1976-77 OPC issue "dots" card #331 of Gary Inness. The mistake is so small it is almost imperceptible.
Give up? The Flyers logo atop the card on the left has a yellow dot in the center. It has been altered to Philly orange in the more common corrected card on the right.