In an episode from an earlier season Krusty acts like his insides are being shredded by a metal Krusty O prize that was being sold in Krusty O's cereal, but it turned out to be just a regular Krusty O, yet he picks up a box at the grocery store in this episode.
When Mr. Burns prepares to leave his house when the bank takes it, he and Smithers walk to the staircase on the second floor and stop on the left hand side of the staircase and are about to climb down. But when the next shot pans out to them as Bret Hart and the real estate agent talk, they are walking down the stairs on the right hand side.
When reviewing his stock portfolio Mr. Burns mentions that he owns stock in a company called, "Confederated Slave Holdings", which one assumes was in the business of the slave trade. Burns then asks how it was doing. However when reviewing his stock ticker he mentions that he last checked it in September of 1929. Slavery became illegal in the United States in 1865. A full 64 years before 1929 when Burns last checked his stocks. If Burns did check in 1929 he would know that slavery was now illegal in the United States and that Confederated Slave Holdings was no longer in business.
When Mr. Burns is talking about where to invest his money he mentions a company called Trans Atlantic Zeppelin. Real life trans Atlantic Zeppelin service ended in 1937 after the Hindenberg disaster. Thus it is impossible to invest in a company that doesn't exist, Mr. Burns, wouldn't have lost any money with that stock purchase. It never happened.
Burns is committed because of his confusion between "ketchup" and "catsup" at the grocery. He is shopping from a written list which would include the relevant spelling.