In 4th season when Hal and Lois find out that Lois is pregnant, they talk about ways to save money. Hal says that it wouldn't kill anybody if they stopped wearing label clothes. Lois answered, that they are not wearing any. Not exactly right because almost whole family is wearing Puma shoes. Take a look:
(Click to zoom)
Now, take a look at these: http://www.google.pl/images?client=f...uma+s&gs_rfai=
As You can see, almost every model has the specific wave on the side, just like those from MITM.
If You pay attention You will notice that every character is almost aways wearing puma. It really looks like MITM had some agreement with Puma.
I found another one. In episode 18 of 4th season, Lois is in the last month of her pregnancy. This didn't seem to bother her and Hal. They had sex in the hotel. MITM crew obviously didn't know that pregnant women can only have sex before 4th month of pregnancy.
And another one. In episode 21 of 4th season, when Lois is giving a birth, once the baby is delivered, it's totally clean as You can see:
Just born children are always covered with blood all over them. Maybe they couldn't show it like that so it isn't too drastic or something but even though showing it perfectly clean is a goof.