The daring hostess put pickled silverskin onions (still sold - as Cocktail Onions) with the cheese and pineapple on sticks. Shop-bought nibbles included Ritz Crackers, Mini-Chips, little cheese biscuits in the shape of playing card symbols (hearts, clubs, diamonds, spades).
A fiddly home-made appetizer was stuffed eggs - cut hard-boiled eggs in half, scoop out the yolks, mix with salad cream, mayonnaise, fish paste, pate, or whatever and pipe back into the whites.
Pepsi was a popular (and at the time fairly novel) non-alcoholic drink. Any sort of cordial (especially lime) or squash (orange, lemon barley, etc) - sarsaparilla was more widely available than it is now.