Differences between TV and DVD versions for Natural Selection:
I'm sure all of you seen this already, but I decided to copy and paste it to show what was missing in the first arc of series. This of course was in the "Night of the Lizard" DVD.
1. In the very beginning of the first scene, extra police sirens are added in the DVD version in order to bridge this episode to Interactions. (Remember, they also added in the extra police sirens during the very last scene of Interactions on the DVD version.)
2. During the scene where Aunt May is counting up her bills and Peter comes home, there is music in the TV version. In the DVD version, there is mostly silence except for the final part of the scene.
3. As usual, no episode title or on-screen credits on the DVD version.
4. The water balloon tossing scene is different in each version, meaning there are different shots that are specific for each version. The pictures above contain those shots exclusive to each version. So in the TV version, Flash hits Peter with five balloons. In the DVD version, Flash only hits Peter with three balloons, although one of them hits him in the crotch, which he covers up with his hand. Other than that, the scene is the same in both versions.
5. In the scene where Gwen says, So [the gene cleanser] will remove any non-human DNA and Peter thinks to himself Even spider, a translucent Spider-Man mask covers half of Peters face in the DVD version. In the TV version, his face stays normal. Also, on the DVD version, the lab is brightly lit in that shot of Peters face, when it should be dark (since most of the lights in the lab are off). In the TV version, the lab is dark, as it should be.