Continuity mistake: When Catelyn meets up with Robb's forces, she hugs her son and then puts her hand on his shoulder/chest. In the next shot, her hand is down by her side. (00:41:40)
Continuity mistake: In order to save him from Drogon's fire at the very end of the episode Jaime is thrust by Bronn into water about 40 feet deep. This shouldn't have been possible especially after Jamie is shown galloping on his horse along the watery beach side just moments before.
Suggested correction: As shown in the following episode, the undercurrents had carried them some distance down-river.
An undercurrent may explain how they eventually got to the other side of the lake but not why the water on the shore became so deep so quickly.
And Now His Watch Is Ended - S3-E4
Revealing mistake: When Karl kills Craster, you can see the blood packet in Craster's mouth right before he spits up blood.
Continuity mistake: The difference between the heights of Ser Jaime and Lady Brianne continually differs. Sometimes Brianne is taller than Jaime by several inches, and at other times they appear to be nearly the same height when standing side-by-side, even though they're always wearing the same clothes and boots.
A Knight of the Seven Kingdoms - S8-E2
Continuity mistake: When Gendry gives Arya the dragonglass weapon that he made for her, in the following shots Gendry's leather cloak straps switch between being crossed with his left strap over the right strap, or his right strap over the left strap. (00:43:00)
Continuity mistake: When Jon and the others emerge onto the other side of the wall, there are 4 people with torches. Pay attention to the one at the back on the screen left. He has his torch in his left hand in this shot, but as the shot changes to the front he now has his torch in his right hand. (00:44:30)
Cripples, Bastards, and Broken Things - S1-E4
Continuity mistake: When Ned and Petyr are walking and talking about Sir Hugh of the Vale, they pass a wheelbarrow while walking in a straight line that simply vanishes from the side of the path. (00:28:05)
Continuity mistake: When Ned executes the deserter, the wide leather straps of Ned's cloak are crisscrossed with his left over his right. But when Ned walks over to Bran, the straps are now crisscrossed the opposite way. Not due to flipped shots.
Deliberate mistake: During the "previously on Game of Thrones" snippets, before the opening credits sequence, there are two flipped shots of Sansa and Jaime as she tells him that she has always wanted to be there for Cersei's execution, but she won't get the chance. (00:01:45)
Continuity mistake: When Grey Worm leads Tyrion to the Dragonpit, as they pass the column of Unsullied their long individual shadows are directly to their sides, but in the next shot the Unsullied are seen in the background and the shadows are entirely different. (00:46:00)
Continuity mistake: When Arya stabs the Night King it's high on his chest, piercing his leather armor. In the next wide shot, the dagger is lower and not in the armor.
Continuity mistake: When Daenerys is dead she has blood underneath her back and hair, and as the camera is above her, her right arm is curved or bent a little. When Drogon picks her up her arm is now straight and despite the blood on the ground she seems to be completely clean. No blood on her back, hair or scarf. Then as Drogon flies away, how on earth did he pick her up with his left hind leg? Did he twist his leg 180° to pick her up with his front claw?
Continuity mistake: While Jaime and the High Sparrow are standing beside Myrcella's body in the Sept, in the overhead shot of Myrcella her right hand is placed over her left hand, but in other shots it's the opposite way. (00:18:30)
Continuity mistake: Arya and Syrio are practising at the start, we see them stop with their swords touching and crossed. Camera changes and Syrio's sword is much lower and no longer touching Arya's. (00:02:10)
Continuity mistake: When Jon is taking his vow at the tree, the red markings on the tree change between shots. 2 single lines become joined, and a third single line becomes less smudged. (00:45:00)
Continuity mistake: When the group of men emerge at the other side of the wall, the last man with a torch has it held vertically. Camera cuts and now it is held at around a 45 degree angle. (00:44:30)
Continuity mistake: When Bran is asking about where his mother has gone he is playing with a lure. Between instant cuts the position of the lure in his hand is constantly changing. (00:15:20)
Continuity mistake: After the attack on Catelyn we see Bran Luwin and Theon talking while Theon is practising archery, the arrows in the board are constantly changing position and appearing and disappearing with no time to do so. (00:13:50)
Continuity mistake: In one shot Sansa is writing a letter to Petyr Baelish, and is pressing a seal onto hot wax on the lower right corner. The next shot Sansa raises the letter, and the wax is gone. (00:39:45)
The Old Gods and the New - S2-E6
Continuity mistake: When Maester Luwin walks towards Theon to try and talk him out of executing Ser Rodrik, he places his right hand on Theon's left shoulder. When the shot changes, his hand is no longer on Theon's shoulder.