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.