The "Virtual Guuy" device future Scott uses to show past Scott their life with Ramona is a clear reference to Nintendo's failed "Virtual Boy" console from the 1990s, including the vivid red vector graphics.
Stephen Stills says "Then you know the game has changed" followed by Kim saying "but the players are the same". This is most likely a nod to MacGruber as those lines are a running gag in that movie and Will Forte(who voices old Scott) is the one who famously plays MacGruber.