Haha well spotted Loco.
It's a bit of an interest for me this subject. The 2 songs have a very similar very similar hook. Similar tempo and feel, it's easy to start singing one then blend into the other. There are loads like this. I dont know who copied who with these songs, they were both 70's.
Saw Her Standing There = When The saints Go Marching in.
When you sing "I'll never dance with another, since I saw here standing there" you could also sing "I want to be in that number, when the saints go marching in"
Or..
The Doors "hello I love you wont you tell me your name" could be "All day and all of the night" by The Kinks.
The Police, Roxanne copied by Bruno Mars, Locked Out Of Heaven.
And do you hear a certain Beatles song here ?
https://youtu.be/0Uc3ZrmhDN4