For me it’s Haydens ghost. Been said already, but for someone who only watches IV or sees the movies in the correct order IV-V-VI-I-II-III, this is a complete “What, who is that?”. You need to see AotC or RotS to understand who it is. And even if you do, it’s hard or impossible to understand why Yoda and Ben are old, but Anakin is young.
This is really hard, but if I could remove only one thing, it would probably be the Jabba scene in A New Hope. Jabba Looks wrong to me here, doesn’t matter if it is the 1997 or 2004 version. The scene itself is also bad and pointless. Why would Jabba show up in person in Mos Eisley? Seems out of character with how he is depicted in Episode VI. The worst however is, that you see him here in the first place. It was better to only hear about him in the first two movies and finally see him in the third. This added scene takes away the surprise for new viewers. They also shoehorned in Boba Fett.
I agree, even if it is my second choice. This is a total cringe-fest, a showcase for why CGI in movies can be not only bad, but awful. Not only does Han walk and wave his hands inside of Jabba, he pleads for his life while stepping on Jabbas tail? Why not edit out that part? Switch to one of Jabba’s goon’s preparing to shoot Han, whatever. This scene was wisely left out of the theatrical release.