Laura and Albert changed their classroom seats in this episode evidently so the audience could see Albert trip and fall. Next episode they will be back in their usual seats.
When Adam and Mary are having dinner they take two pots out of the oven and place them on the tablecloth. Those pots would be super hot from the oven and they would not be placed directly on the tablecloth.
Laura and a classmate are making plans to go fishing and Laura offers to make sandwiches. The classmate tells Laura to make peanut butter sandwiches. Peanut butter wasn't invented until 1895. If Laura was roughly 13 in this episode it would have had to have taken place in the very early 1880's, almost 15 years before peanut butter came along.