Glen tells Dougie that he can't mow the lawn as he has a study group. This is unlikely as the conversation takes place on Australia Day (January 26th) when all Australian schools and universities are on holidays.
Edward commentates to himself before bowling the first ball of the backyard Cricket match on Boxing day (December 26th) that there's perfect conditions at the 'Gabba. Brisbane usually has its test match a few weeks prior to Christmas.
The songs, "Two Can Play" and "Summer of '81", appear in the credits twice.