There's plenty of time for the scene to have more meaning. Perhaps Nora became pregnant despite the IUD and that lends further mythology to The Book of Kevin?

I wondered the same. Obviously Wilfred, a television show, is insignificant in the scheme of Robin Williams' life and depression, but I wonder if he ever considered waiting another week to see how a series he reportedly admired ended? Probably not.

Never mind, thankfully already answered.

He bets on red because he saw the birds sitting atop the blinking red light at which he stopped abruptly en route to the casino. He thought the birds were giving him signs throughout the episode.

Yikes.