Even the pros make mistakes. As dancers we put so much pressure on ourselves to be perfect. But guess what? That was a pro dancer in the Left Shark costume. He/she was getting paid for that performance and still made a mistake. Stop putting so much pressure on yourself, making mistakes is part of being human.
Fake it 'til you make it. So the choreography didn't match up completely with Right Shark's crisp moves, but Left Shark didn't care. The best thing he/she could do is keep going on. Can you imagine if a shark went running off the stage because it forgot its choreography? The better option was clearly to have fun even though it wasn't exactly right. Remember that if you blank, just keep moving, it's way less obvious.
Dance is fun. No doubt that whoever was in Left Shark was having a ball. Just being on stage is a gift itself, but a Super Bowl stage, now that's the experience of a lifetime. Left Shark undoubtedly was loving dancing for the sake of dancing.
Baby you're a firework! You've heard it a million times, but dance like no one is watching. This is by far the best way to enjoy dance. Ignite your light and let it shine!