When Homer holds up Flanders passport it is revealed his full name is Nedward Flanders.
Barney said "It is the purpose of government to see that not only the legitimate interests of the few are protected but that the rights of the many are conserved." The quote is attributable to Franklin Delano Roosevelt (Franklin D. Roosevelt).
When Lisa looks through the viewfinder binoculars, music starts playing while the letters H and O flash on the screen. This spoofs the opening credits of Fringe (2008). The pilot episode and several seasons of Fringe (2008) were filmed in Canada.
When Lisa first lands on the Canadian side of the falls, in addition to the Mountie and the medics a beaver in a cape comes out of the rapids to a heroic theme very close to the Superman theme. Parts of Superman II (1980) were filmed in Niagara Falls and Superman saves a boy who goes over the falls. He later saves Lois out of the rapids dressed as Clark Kent.
SNC-Lavalin Affair, as mentioned by Lisa, refers to an engineering firm located in the province of Quebec. They were a large contributor to Trudeau's party, and were charged with fraud and corruption with respect to their international dealings in Libya. It was alleged that they asked various government officials to put pressure on the prosecutor's office to either defer prosecution or lighten the criminal penalties with respect to office's investigation.