The beginning of the episode shows Luke riding his bike to school. Later in the episode but seemingly on the same day, Luke and Kate are walking to Luke's house after school but Luke does not have his bike.
The series is set in fall 1996, but characters are depicted drinking the soft drink Surge, which was not released until 1997. Characters also refer to "the new Oasis", meaning the album "(What's the Story) Morning Glory?", which came out in October 1995 and would have been almost a year old at this point.
Luke refers to the CD he receives through the mail as the new Oasis album. On 27th September 1996 (the date this episode takes place), What's the Story (Morning Glory) had already been out for a year.