I have to find some literary devices in the song "I Saw Her Standing There" by the Beetles. I can't come up with anything.
Here's a link to the song lyrics: http://www.azlyrics.com/lyrics/beatles/isawherstandingthere.html
The lyrics to this song are not especially ripe with literary devices. It is understandable that you might have trouble identifying some examples.
Two literary devices do stand out - onomatopoeia and repetition/refrain.
Onomatopoeia is a literary device that creates/utilizes language to mimic sounds (or sound effects). The Beatles use this literary method in a line in the middle of the poem.
Well, my heart went boom
When I crossed that room
Here the term "boom" is being used to describe the sound and feeling of an explosive or highly energetic heartbeat, which is a standard mode of onomatopoeia that stradles the border between the metaphorical and the literal. The term "boom" suggests an actual rendering of the sound the heart makes but, of course, also indicates an exaggeration meant to represent a figurative explosion of feelings. (This exaggeration might be identified as an example of hyperbole as well as onomatopoeia.)
Additionally (and more pointedly) this Beatles' song uses repetition in the form of a refrain to create structure and also to establish a resonant theme.
Refrain - a phrase or verse recurring at intervals in a poem or song[...]" (eNotes).
The lyrics utilize the following refrain often, substituting various terms where the ellipsis appear here:
...never dance with another
Since I saw her standing there
The repetition of this phrase manages to do at least two things. The moment of observing/noticing one another becomes crystallized and given an almost iconographic status for the two lovers of the song. And the historical or turning-point nature of that moment is established via this repetition and so becomes a resonant event, full of specific meaning. The moment is thus frozen in time as it is repeatedly told in the refrain and it takes on a deepening meaning as well.
To offer one more idea, we can identify a rhetorical question in the song as well.
how could I dance with another
This line is not meant to be answered in any kind of literal way and so becomes a rhetorical device intended to prove a point rather than actually pose a question.