The Cadillac that Mike drives to meet Walter and Jesse (and abandons afterwards) is the same car Jesse took from the Cartel party in Salud (episode #4.10).
Jesse says that he is 96% sure that Ed, the vacuum cleaner repair shop owner, is "the Disappearer". Jesse cooked a meth purity of 96% for the Mexican Cartel. Also, Jesse's gunfight with Casey is photographed in the same manner as Jesse's gunfight with Hector Salamanca's grandson, Joaquin, whom Jesse shot and killed in "Salud".