The first is not showing the player's relics until their opponent has joined the game. Right now it's easy to cheat by checking your opponent's relics before joining the game and picking relics that counter them.
The second is playing a distinct sound whenever a new game is created.
Since a few of us usually have Spectator in another tab, I think this would help a lot. We wouldn't have to repeatedly check the tab and we would instantly know when someone created a game, allowing us to get there faster.
However, I wouldn't want the sound to play when a rematch is created because they would be frequent and you wouldn't be able to join.