Typically Bart tags walls with 'El Barto', but since he's in Cuba where Spanish is the official language he tags the wall with 'The Bart'.
In the opening sequence, Bart writes "Being Right Sucks" on the blackboard. This is in regards to a 2000 episode of this show that predicted Donald Trump would run for president. On November 8, 2016, Donald Trump was elected as the 45th President of the United States, beating out Hillary Clinton.
In the Olympian couch gag, Lisa springs from Homer's skull. This is a reference to Athena who sprung from her father Zeus' head in much the same way.
This is the last episode animated by Film Roman Productions, which had been with the show since the fourth season. Starting with "Dad Behavior", the show would be animated at Fox Television Animation. (Now 20th Television Animation)