Immediately after Lex and Eric exchange Christmas gifts and just before they head off on their final ski lesson, a Canadian flag can be seen flying in the background, as the movie was filmed in Canada (more specifically at Big White outside of Kelowna, British Columbia) rather than at Aspen where the movie is set.
When Lex and Eric are negotiating for the taxi from the airport, Eric mentions that the delay in available taxis is due to a race at Big White. The movie is set in Aspen, while the movie was actually filmed at Big White in Canada.