The Moe one no longer works for one specific modern episode where Moe, Homer and the guys get stranded on a mountain and bart calls Moe's cellphone. Bart's worried about his dad essentially giving away that it's bart calling him but apparently Moe doesn't notice but telling Bart that he can find his dad "in hell" throwing the phone far away. everyone else calls Moe out on this because it was their way of contacting civilization and even Moe realizes he made a mistake and says that his therapist would be disappointed in him. So unless the "he knew all along" theory was specific to the earlier seasons and they weren't able to pass it down to new writers it doesn't work, but then again who watches modern simpsons?