Connections

The title is a parody of the earlier film

Jonny refers to Claes as "Don Corleone", after Marlon Brando's gangster-character

Claes refers to Jonny as "Johnny-Boy", after Robert de Niro's gangster-character

The actors who play couple in Den bästa sommaren plays one of the couples who gets married in the movie Bröllopsfotografen and when they are asked how they met they answer that "it was the best summer"