In the prison dining hall scene where the prison gang starts harassing Kreese, one takes his roll and starts eating it. However, when the scene cuts back to Kreese, you can see the roll still on his tray, completely intact.
Daniel and Amanda enter Mr. Miyagi's bedroom for the first time in many years, implied to be the first time since his passing. Mr. Miyagi is said to have died in 2011 while this season takes place in 2018. There are live bonsai trees in Mr. Miyagi's room. Bonsai need to be watered fairly regularly, usually every few days. Trees would not survive without water for 7 years.