When Onslow arrives outside Elizabeth's, and Rose introduces Liz and Emmet to Mr Wotsit, Onslow is wearing his green parka, when we see him pull up behind Richards failed car, he is in his vest and tank top
Daisy mentions that if Rose gets married she and Onslow will be alone. She must have forgotten that her father also lives with them.
Marie Antoinette was married to Louis XVI not Louis XIV.