Not really. They choose to hint at things that are implied in the book for maximum reaction like Theon's castration, but they also do that with revealing that Renly and Loras are explicitly gay or that Margaery is just as scheming as Olenna.
Simultaneously they do choose to cut things when they think Martin goes too far. You complain about the Red Wedding, but as I recall they showed neither Cat mutilating her face or her body being stripped naked and thrown into the river. Those both would have been far more graphic than what we got in the battle. In the same vein, they chose not to have Tyrion's nose totally cut off like in the book.
It is the give and take for adaptation.
As for Talisa's womb stabbing, the point you really seem to be harking back on, I would argue it was done as a character moment. In the books, Jeyne Westerling is just a dangling plot thread that is left hanging by Martin. Probably indefinitely. Beyond wrapping up that plot thread by killing her off, it maximizes the loss for Robb Stark (and thus we the audience) of not only knowing that he dies, but that his hope for the future with a Stark heir in Winterfell seemingly die. In short, it makes the scene sadder and maximizes the punch while also surprising book readers who felt cocky in knowing how it'd play out.
I actually think it was a wise addition to the show.