Factual error: Rob mentions several times "I broke my cheek" if he actually broke his cheek we could see a spot there, either a divot in his face where the accident happened and was not fixed, or we would see a indent line from where they put stitches on his face. We see neither of these.
Love Thy Other Neighbor - S5-E29
Other mistake: Laura tells Rob that Jerry is fixing the fence. Then all of a sudden this banging that sounds like an iron hammer and chisel on cement starts up. If Jerry was actually fixing the fence it would have been the whole time, right when Rib got into the kitchen, not right after Laura told Rob that Jerry was working on the fence.
Don't Trip Over That Mountain - S2-E22
Character mistake: Laura tells Millie that the phone rang 6 times. The phone actually rang 7 times.
Long Night's Journey into Day - S5-E23
Other mistake: Millie tells Laura "I never sleep in my house alone!" yet Millie has been home about 2 or 3x by herself. In other episodes. Like when Jerry goes out of town usually.
Character mistake: Rob tells the people that are about to get on the elevator "my wife is expecting a baby!" In all the other episodes where "she's expecting a baby" as well... No change in stomach size at all! Not a single sign of pregnancy... (After 12-16 weeks it starts to show that the baby is there.) Even before Richie was born, still flat as a pancake.
A Nice, Friendly Game of Cards - S3-E18
Character mistake: While Rob, Laura, Buddy, Jerry and Millie are telling Sally what happened before and during the poker game Laura says "We should have played charades!" Yet she didn't actually say that... Rob said it. Jerry insisted they play poker anyways.
The Life and Love of Joe Coogan - S3-E17
Other mistake: Rob is discussing the box of love letters with Laura she tells him "they're by the furnace!" Rob tells her "there's no shoe box by that furnace." Laura tells him "they're right behind some loose bricks" well when we see the basement... There's no furnace or bricks anywhere to be seen.
Other mistake: Laura tells Rob "oh you don't smoke!" But in several (double digit) episodes Rob not only has a lighter but also a cigarette in his hand or mouth. One episode while he and Laura are illegally about to eavesdrop he puts out the cigarette on the speaker causing the speaker to turn on and they start eavesdropping again.
Other mistake: That mirror behind Rob at the hotel in their room has fog (condensation) on it which means that the humidity there in "Mexico" is really really high or it's over 100°F in their room with humidity or unless it was raining inside their room, the window behind the bed is perfectly clear. (Real life that mirror would not be all foggy.) Also Rob, Laura and the hotel guy would have been sweating up a storm if it was really really hot out there. Which it wasn't. (00:13:52)
Deliberate mistake: While Rob is on his honeymoon, as well as 3 day pass, things like that, Rob still wears his army outfit. Yet in real life us real humans wouldn't be wearing the same clothes every time we were out. We would go home and change.
Factual error: Rob and Laura went on only 1 honeymoon back in episode "Honeymoons Are for the Lucky" (while Rob and Laura are in Missouri, at a hotel less than 1 hour away from Camp Crowder) yet in this Alimony episode Rob and Laura say they were in Texas but went to Mexico for their only honeymoon.
Revealing mistake: If Rob and Laura actually did dye their hands not only would their hands be black but so would their wedding rings. Also, while Laura is "using water" on her hands you can tell she wasn't using water or soap because her hands aren't wet and there isn't any soap to be seen at all... You only see the dish rag. (Same for when Rob does the same thing later on). (00:06:07)
Other mistake: After Lyle gives back Rob and Laura's watch's and the $51, Rob doesn't get his ring back.
Other mistake: Rob mentions Buzzy Potter to Sally and Buddy as if they knew him. Rob and Laura did the Army stuff way before working on the Alan Brady show. Also, there was no mention of Buzzy Potter anywhere else in the series. There for Sally and Buddy wouldn't have known Buzzy, but Millie would have known him.
A Nice, Friendly Game of Cards - S3-E18
Other mistake: With the way everyone was holding their cards, there is no way Rob could have been reading the back of everyone's cards.
Factual error: Alan Brady and Mell's offices are a few floors up. Yet Rob, Buddy and Sally's office window shows that they are way higher up than Alan and Mell's office - you do not see the roof tops of buildings anywhere from Alans and Mell's offices.
Factual error: Talking to the lawyers, parties, or witnesses about anything. This will give the impression that something unfair is going on. And is also illegal. Which Rob was doing during this whole episode.
Other mistake: The record that is to Rob's right (our left) isn't spinning while the base part under it is, until Rob puts the ceramic coffee cup on the record. Notice that ceramic coffee cup is also the same coffee cup that Rob threw away in the episode "Your Home Sweet Is My Home"
Suggested correction: So you are claiming that they somehow rigged the turntable so it would spin without spinning the record until he put the cup down on it. For what reason? No only does this error defy common sense, it is obviously wrong if you watch the episode. The record is spinning. You can see the variations in the highlights on the surface as it does so. Also, it is not a ceramic cup, it is a paper cup, complete with a folding paper handle. And it in no way resembles any cup used in "Your Home Sweet Home is My Home."
I did great! I forgot which episode I saw the same cup in.
Happy Birthday and Too Many More - S3-E15
Other mistake: Laura is doing some work on when to have Richie's birthday, and Rob tells Laura "I thought we decided that about 8 years ago." Yet Mrs Billings has asked Rob to do 2 plays (1 each year for the PTA meetings) In the Happy Birthday... (Feb 1964) episode that would have made Richie about 10 due to the fact that Richie was 8 when "What's in a middle name" (Nov 1962) aired. (00:01:00)
The Ballad of the Betty Lou - S3-E9
Other mistake: While Jerry and Rob are furious, Jerry asks the sailor "What's the matter with the lights?" and the sailor says "power failure on the line, they can't locate it." If there's a power failure then the room would be completely dark just like it is outside. Yet Rob and Jerry have shadows on their hats, jacket, shirts etc. as well as a shadow from the bunk bed. These shadows are caused by the non-working lights or the lights behind the camera.