Continuity mistake: While showing the other tank commanders the unit's objectives on the map with his finger, Lieutenant Parker removes it, but the next shot of him and the tankers shows him still pointing on the map. (00:18:20)
Continuity mistake: As "Fury" and her crew roll towards the house/aid station, they pass by a gate. The next shot shows the tank still some distance from the gate. (01:23:10)
Continuity mistake: As Sgt. Collier shaves, Irma is pouring coffee in the kitchen by the sink, facing Collier. The next shot she is standing in front of the stove. (00:58:30)
Continuity mistake: When Parker is engulfed in flames, he pulls out his handgun and shoots through the helmet in his right temple. In the next shot, there is neither a bullet hole nor blood stain on his helmet. (00:24:25)
Other mistake: The credits list "Young SS Trouper" instead of "Trooper." (02:03:30)
Continuity mistake: When the SS officer is killed for hanging children, his papers land by his head. When the shot changes, his papers are now by his feet. (00:48:30)
Continuity mistake: Just after Norman has been made to shoot the German, he lies on the floor with his face buried in his arms. Camera cuts and his position has changed and you can now see his face. (00:39:20)
Continuity mistake: Wardaddy gives Norman the ultimatum of "him or you." When he does, he's pointing his revolver at Norman. Camera changes and he's no longer pointing at Norm. (00:38:30)
Continuity mistake: Just as the tank column breaks through the hedgerow to rescue the troops, Wardaddy either has his goggles over his eyes or on his helmet depending on the shot. (00:29:10)
Continuity mistake: During the Jesus loves Hitler scene, Wardaddy's goggles keep shifting position on his helmet from crooked to level and vice versa. (00:21:50)
Continuity mistake: We see Sgt Davis standing next to Wardaddy getting the brief on the new mission. In one shot he has his arm raised with a mug in his hand. When the shot changes, his arm is now lowered. (00:18:30)
Continuity mistake: When Wardaddy shouts at Norman about "that is a German, that's who we kill", his arm is either bent or straight depending on the shot. (00:17:50)
Continuity mistake: When Norm takes the picture off the post in the tank near the start, the way he holds it changes between shots from the extreme corner to further down. (00:15:40)
Answer: Gordo was making a point to Norman that the crew of the "Fury" had seen some horrible things during the Battle of the Falaise Pocket. After wiping out an entire German army there, they were tasked with putting wounded horses out of their misery. The point was that Norman was not there, and did not experience what they had, so Norman could not judge the tank crew's actions.
Scott215
Gordo brought up the horse thing because him and the other (original) crew members were not happy with Don and Norman enjoying a nice, quiet meal without them. He even say's "You weren't there" meaning Don sharing this with Norman when he hadn't yet been through much war time like all of them had, together. They also say "We weren't invited", "Why weren't we invited." The horse story was to get at Don for not inviting them and sharing it only with Norman.