Goku gets to keep Bardock’s scouter, a way to remember him and hear his voice. I saw someone said Goku now has 2 items he can cherish, his grandpa’s 4 star Dragon Ball and the scouter. I know Goku had no deep interest on getting to know or meet his real parents before, he could possibly in the near future. But I don’t think he needs to, I’m just glad he remembers them in a way and he just kept moving forward.