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Continuity
When Stewie asks for Mort Goldman in the Warsaw Temple, a Jew with a beard and hat is sitting at the front on the first seat the right hand side. The shot where it first showing Mort at the Warsaw Temple, he is at the front on the first seat of the right hand side.
While escaping the German roadblock dressed in clerics, Mort Goldman's collar - which has no attached rabat - is removed by the German officer then is seen again back on his neck while in the motorcycle sidecar.
When Mort goes into Stewie's room and finds the time machine, there is a large sign on the bedroom door saying: 'Stewie's room, keep out Brian.' This sign is not present when other characters enter or exit the room.
At the end of the episode, right before Mort enters Stewie's room (again), there doesn't even appear to be a bedroom door, then a few seconds later, Mort opens it.
When Stewie asks for Mort Goldman in the Warsaw Temple, a Jew with a beard and hat is sitting at the front on the first seat the right hand side. The shot where it first showing Mort at the Warsaw Temple, he is at the front on the first seat of the right hand side.
Events establish that Mort's Grandpa Haim's wedding was the same day and location as the start of World War II. Such a correlation of events would always be remembered and legendary in his family, that they had only an hour or two of wedded bliss. Mort being at the wedding - especially once he finds out this isn't heaven but time travel - this would have been the first thing he realized, the famous events which also happened the same day and place, but he's still taken by surprise.
Brian, Stewie, and Mort time travel to a wedding in Warsaw Poland on September 1, 1939, whereupon they encounter invading German troops. Although the Germans crossed the Polish border on September 1, they didn't reach Warsaw until September 29.
Mort, Brian and Stewie arrive in London in early September 1939 and the city is filled with bombed and smoking buildings. England declared war on Germany on September 3, 1939 and Germany did not bomb England until July 1940, the Battle of Britain.
If Stewie and Brian go back in time to the exact time and place Mort went, Mort should have been there, not already on his way to Warsaw.
Stewie mentions that Sept 1, 1939 was the exact day and year that Rene Russo was born. When in fact she was born on Feb 17, 1954.
Brian states that England is the nearest safe country, despite the fact that the journey there would most likely pass through neutral Switzerland and even Spain would be closer (although Generalissmo Franco's conservative Catholic regime would not have been welcoming towards the Jewish Mort).
At Warsaw Temple, when Mort says, "...my bargain hunting Aunt Flo", production initials appear at the right bottom corner next to Brian's tail for about 3 frames.
The German uniforms have no doppellitzen or proper insignia, and armed forces troops are all depicted wearing NSDAP armbands.
Somehow, British intelligence completely failed to notice a German U-boat sailing up the Thames or docking in the heart of London and three possible enemy agents disembarking from it.
When escaping Nazi-occupied Poland, Mort dresses as a Catholic priest to hide the fact that he is Jewish. Nazi Germany was known to imprison and kill Roman Catholics as a way to "re-Christianize" Germany just as much as they did to Jews, so Mort would have been either imprisoned or killed either way.
Germany's Offensive against Poland started in the early Hours of September 1st, officially at 5:45 as stated in Hitlers famous Speech at the Reichstag later that Day. So normally, the Moment Brian and Stewie arrive at Warsaw, Germany would be already at War on Poland.
Set in September 1939, Brian and Stewie fly an Avro Lancaster on a bombing mission to Germany. However, the Lancaster didn't enter service until 1942.
Enriched uranium was not developed by Heisenberg's team for some time after the expansion into Poland.
Mort, Stewie and Brian attend a Jewish wedding in Warsaw on September 1st, 1939 so it must be later in the day since it was a Friday. The German invasion of Poland of course famously started before the break of dawn. Following several German-staged false flag incidents such as the Gleiwitz during the night of 31 August, at 04:45 in the morning, the old German warship Schleswig-Holstein opened fire on the Polish military transit depot at Westerplatte. In Hitler's 1 September 1939 Reichstag speech, of which there is an infamous audio recording, he lied "Seit 5 Uhr 45 wird jetzt zurückgeschossen!" (Since 5:45 a.m. we have been returning the fire). It is one of his best-known quotes and among the most infamous utterances of all time.
Germany did not have any homing torpedoes at the outbreak of the Second World War so a submerged submarine had no means of effectively attacking another submerged submarine.