Actually, Artist KS is completely right. Snow Way Out was aired as Episode 66 in English. It was originally intended to be Episode 041, but was rescheduled after the Electric Soldier Porygon incident. For those that don't know, Episode 038 (Electric Soldier Porygon) caused hundreds of Japanese kids to have epileptic seizures because of strobe lighting effects. The show was stopped for a few months afterwards, as a investigation as to why this happened took place. So the order of episodes was mixed up. "Holiday Hi-Jynx" and "Snow Way Out" were intended to take place just after Ep. 038. As the show was post-poned for several months, that never happened, so the English dub just placed them randomly into their version of the anime.
Sources: Electric Soldier Porygon, and Snow Way Out