Cardcaptors

Neither Sakura or Li were wearing their fighting costumes during the battle against the Earth Card, but after Sakura seals the card they are suddenly both wearing their costumes.

When casting the Sleep Card, Madison somehow did not fall asleep unlike previous episodes when she was amongst the first ones to do so.

When Kero is looking at the cards Sakura's captured, you can see the freeze card, but Sakura never captured this card.

Because the US release of Cardcaptors didn't follow the original episode order, changes had to be made to various episodes to adjust for characters who had already (or had not yet) been introduced. For example, Li's line at the end of this episode is different in the two releases: (US version) Li: (on top of the museum's roof, holding his Lasin Board) Not a bad capture, Sakura. (non-US version) Li: (on top of the museum's roof, holding his Lasin Board) There's a Clow Card nearby.

This is the first time that Madison finds out about the Clow Cards, Sakura's magic, and Kero. She then joins them to help capture the missing cards in thisepisode and in future episodes.