A problem with gravity on Terra Nova

The humans here are portrayed in Earths past, during times when huge prehistoric reptiles were still roaming the countryside.

During this time, some these reptiles had too much weight to be alive at all in today's society, because today's gravity would literally crush their bones, and they would just collapse. I don't see the humans jumping around like it's the moon, floating up into the air a little bit, not that gravity would be quite like the moon, it would be just a little bit heavier, however this show portrays them as being in today's normal earth gravity, which seems to me to be completely unrealistic.

I think this is the shows biggest failing. The inability to portray the earth and its gravity properly, as I would have really liked to have seen the attempt. In stead, the show skips past the things which really matter in a show where you travel to this time. I am aware of suspension of disbelief, but what a missed opportunity to get people who are knowledgeable about such things tuning in, however the TV network simply guesses the average viewer not to know or care I guess.