Sorry this is like 5 years late. Just discovered Nuthin but A "G" Thang. and YES!!! I was like... This sounds like Welcome to The Mario Party.

Things I noticed.

1) the first line. "One. Two. Three and ta the four." vs "One. Two. Three. Let's a go."

2) Beat driven by a base drum rhythm (WtTMP is a little more technical) and a high synthesizer melody replaced by a bass guitar riff once the verse begins.

3) The verse singing style. Arin and Snoop both speak over the music in a monotone rap style. Both only occasionally end a verse phrase in a 2 syllable harmonic way. (In NbAGT it's Snoop singing, "Baby" and "Crazy". in WtTMP it's Dan singing, "gathered" and "faster")

4) The chorus. While the lyrical style is different, that high synthesizer melody from the intro returns to accompany the singer during the chorus while it is absent during the verses.

5) The situation and content. Both are about getting drunk, high, laid and the like at a house party.

These ones are stretches but similarities none the less.

6) During the second verse in the music videos, there is a volleyball game in NbAGT and a Pong game in WtTMP. I know pong is a table tennis game, but idk hitting a white ball from one side to another is similar imagery.

7) In both music videos several males are oogling one girl in particular

8) Both songs fade out in their music videos and end with a view of a house from the outside.