When Anton falls into the hole and is clinging to the pipe, the townspeople drop a rope so that Charming can lower himself down and rescue Anton. However, before the rope is even brought to the hole, there's a shot of Anton in the hole with the rope dangling behind him.
In the hospital, Greg asks Belle what she saw on the night of his accident. She tells him she saw a fireball, and he says he saw it too. But there's no way he saw it because Mr. Gold only had the fireball activated for a couple seconds, and his car was too far away for him to have seen it. Also, by the time he got to the town line, Gold no longer had the fireball activated. So Greg couldn't have seen the fireball. Therefore, his story doesn't add up.
Logan Airport's boarding gates all include letters that correspond to their respective terminals (example: C17), but none are shown.
Anton takes a magic mushroom that shrinks him to human size. His clothing magically shrinks as well. Since the mushroom was ingested, it would affect him and not his clothing. Similarly, Regina gives him another mushroom and the same thing happens in reverse.
Rumplestiltskin tells Emma and Henry that they're driving down from Maine to Logan Airport in Boston, Massachusetts for their flight, which the after-credits teaser says is to New York City. This is a needlessly long and ultimately unnecessary drive for them, as the airports in Bangor and Portland have direct flights to New York City, and the smaller regional airports in Bar Harbor, Augusta and Presque Isle offer shuttle flights to Logan.
Henry gets excited to see a Cinnabon stand after clearing security at Logan Airport's Terminal C. Per Massport's own website, there is no Cinnabon stand anywhere at Logan.