The Ida Funkhouser Roadside Memorial - S6-E3
Continuity mistake: In season 4, episode 5, Marty Funkhouser is speaking at his father's testimonial. During his speech, he says that his mother died 10 years ago. However this episode is based around Funkhouser's mother's sudden death despite the fact that Marty previously claimed that she died more than 10 years earlier.
The Bracelet - S1-E4
Continuity mistake: This mistake really applies to two episodes in season 1. In The Bracelet, Larry is approached by a homeless man who thanks him for the Chicken L'Orange. As a result of this (and his unkempt appearance), the women at the jewelry store will not buzz him into the store. The mistake is that Larry doesn't give this man the Chicken L'Orange until the 7th episode, AAMCO. And it is not just that the episodes aired out of order. Because in the episodes between these two, there are references that show that this IS the correct order of this season. So this becomes a circular reference that can't possibly exist.
Visible crew/equipment: Before Larry walks out the door of his house, at the start of the episode, the fingers of a crew member are visible to the right of screen.
Ted and Mary - S1-E2
Continuity mistake: At the bowling ally, when Larry's wife picks up her shoes, the man behind the desk hands her 2 black shoes. As they are leaving, Larry's wife is wearing white tennis shoes. When they arrive at home, she is wearing the black shoes again.
Continuity mistake: In this episode when Larry is cutting the dolls hair first he starts with a swiss army knife but while he is cutting he is using a regular pair of scissors.
Revealing mistake: In the shot where Suzie lands on the sponge cakes, the safety mattress under the cakes briefly jumps into the frame.
Continuity mistake: When everyone is in Larry's house, sitting in the TV room and eating the brownies, the amount of brownies on the plate changes between shots.
Continuity mistake: Season 5, episode 2, "The Bowtie" In the scene where Larry is at Omar Jones' private investigation office for the last time, Jones has a thick amount of hair. In what is supposed to be moments later, when they meet outside, Jones' hair is much shorter.
Continuity mistake: In the 6th season episode, "The Freak Book", when Larry first gives John McEnroe the book, it's a hard cover book with a dust jacket. At The End of the episode when Larry and John get kicked out of the Staple's Center, the book has changed to softcover.
Other mistake: In the second season episode "The Car Salesman", notice the license plate on the real estate agent's truck. It is the same license plate that is later used in the season 5 episode, "The Ski Lift".
Continuity mistake: Season 5, episode 1, "The Larry David Sandwich." After Larry's near-death experience, he's at a party talking to Jeff and drinking from a very small cup. At first Larry's fingers are in the handle, but when he actually starts complaining about how small the handle is his entire hand is cupped around the cup.
Continuity mistake: When Larry tries on the cream jacket in Crazy-Eyes' bedroom, he drops his black jacket onto the floor. But when he leaves the room wearing the cream jacket, he grabs a black jacket from a hook near the door.
Continuity mistake: When Larry confronts the blonde lady trying to chat and cut in the buffet queue at Jeff and Susie's party, her friend, Brian, has food on his plate initially but not in the next shot. (00:04:25)
Continuity mistake: When Larry and Jeff are at the restaurant and the waiter's arm catches fire from lighting the flambé dessert, Larry puts it out by pouring water on his arm. The wide shot shows the flambé dessert is no longer on fire. But on the next wide shot, the dessert is on fire again.
Plot hole: In the final episode of season 6, Larry tries to find the name and phone number of the woman he was talking to in the waiting room. The receptionist begins to list the names on the sign-in sheet until she reaches 'Paula'. Larry nods to this, however Paula never told him is name, nor was there ever an off-screen moment when she could have. She could have been any of the women the receptionist named.
Suggested correction: In this scene, I assumed the receptionist was giving Larry some subtle signal that she knew it was Paula, and Larry is kind of pretending to already know.

Continuity mistake: Larry is sitting on the couch close to the arm, drinking wine. Susie sits down, making Larry spill his wine on the couch. Larry is now sitting in the center of the couch. (00:11:49)
Visible crew/equipment: At the beginning of the episode, when Cheryl answers the phone on Larry's behalf, there is a shot of Larry walking around the living room and taking a bite out of an apple. If you look in the window behind Larry you can see the boom pole moving around. (00:02:32)
Visible crew/equipment: When Cheryl invites her friend to go to the cinema with Larry and passes him the phone you can see a brief reflection of the boom microphone in the window behind Larry. Just before Larry says hello. (00:02:52)
Continuity mistake: Larry is eating his lunch in the rabbi's office. He has a piece of chicken from a breast or thigh in his hand and in the next shot showing the rabbi he is holding a drumstick. (00:26:00)
The Accidental Text on Purpose - S9-E6
Audio problem: When Larry is in the dressing room with Lewis' girlfriend, she is heard saying "No, an accident is tripping...", but in the shot of Larry, she is saying different words than what we are hearing. (00:26:20)