When Dina punches Carol in the stomach and catches the cat carrier, the cat inside is clearly fake. It is smaller than the actual cat, unmoving despite being thrown, and lying down. When the camera angle changes, the cat is suddenly much larger and standing up.
After noting that Amy had taken over the wedding prep, describing it as the most Amy thing imaginable, Eric asks how he and Mateo can help. Amy replies with annoyance that they didn't offer to help until preparations were almost complete. Both were present when Amy was handing out tasks to the Cloud 9 employees. There's no reason she couldn't/wouldn't have assigned them tasks then.
Despite being right handed, Jonah is shown cutting meat left handed.
After the party bus driver has finished eating the laxative-filled cupcake, the exaggerated lip-smacking noises he makes do not match the movement of his mouth.
It is revealed that, even though Sandra and Jerry asked overtly-religious Glenn to perform their wedding, they requested he perform a non-religious ceremony. In Cloud Green (2019), Sandra was shown as part of Glenn's bible study group, implying that she is a practicing Christian. In Toy Drive (2019), after being asked to officiate their wedding, Glenn got ordained online so he could perform the ceremony, of which Sandra and Jerry were aware without any objection, something he wouldn't need for a non-religious wedding.
When Glenn relays the story of crab sweatshirt to the wedding attendees, he refers to is as a t-shirt.
After informing the guests that Sandra and Jerry requested a non-religious ceremony, Glenn says he will be quoting from a book written by the greatest and most powerful author in the history of the world. He then quotes from 1 Corinthians 13, implying that God is the author of the bible. The bible is made up of many books from various sources, all of which were written by human people. 1 Corinthians is usually attributed to the apostle Paul and Sosthenes.