* The title "Hey Jude" is an allusion to Jude, the patron saint of lost causes. This is fitting as the song is about offering comfort and support to someone going through a difficult time.
* The line "Take a sad song and make it better" is an allusion to the nursery rhyme "Hey Diddle Diddle." This line suggests that even though things may be tough, it's possible to find happiness and make things better.
* The line "The movement you need is on your shoulder" is an allusion to the biblical story of Jesus carrying the cross. This line suggests that the person the song is addressed to has the strength and support they need to get through their difficulties.
These are just a few examples of the many allusions found in the song "Hey Jude." By using these allusions, the Beatles were able to create a song that is both meaningful and memorable.