I believe I do have a timeline of events that you might find informative.
While playing a round of charades, Deborah calls the rest of the family “spaniels” for deliberately avoiding the correct guess, even though she had already revealed the answer accidentally.
The family each rip up the hat that they get from their cracker, although Alex has to first be reminded to do so.
Instead of Christmas pudding, Deborah has half a scotch egg.
At one point during the call, Alex tells Toby to let their dog, Oswald, out.
Upon arriving at the restaurant, Jerry realises that it is a posher venue than they were expecting. He reluctantly enforces “Gale Force 5 table manners” on the children.
As compensation, Jerry promises that they will keep the meal to a short two courses and declares open season on the pudding menu. Since Deborah doesn’t like pudding, she is offered the option to have a starter for pudding instead.
Jerry counts them all down to the start of the enforcement of manners. During the five second countdown, the family make wild and rude noises. They stop immediately when he reaches zero and all commence best behaviour.
Hilla is surprised that baby Debbie wants to be fed more. Jerry suggests that it’s because she is ready for her pudding. However, Hilla is heard to ask “Well, don’t you want it?”, suggesting that Debbie ultimately doesn’t want her pudding.
The baby is making raspberry noises as Hilla deals with her. Hilla requesting that Debbie saves her “the raspberries of impatience”. This leads to Jerry composing an impromptu, fruit-themed, nonsense song on the piano.
Hilla helps him to find fruit names that correctly scan within the tune.
She also gets a small plastic cowboy from the cracker, which she gives to her grandson, Benji. Benji is warned not to snatch by his mother, Hilla, who reminds him that “Level 3” behaviour is expected.
Deborah chooses to pull her cracker with her grandfather, Walter. Vanessa indicates to Walter that his cracker is on his side plate. Deborah wins, but questions if she has to rip up her hat. She asks if that tradition comes from them being a bit Jewish.
Hilla tells her that lighting the candles is because they are a bit Jewish, but that the hat ripping comes from the Wilkinson side. It transpires that the tradition dates back at least as far as Uncle Newt’s childhood.