What makes personas friends unforgettable in song auld lang syne

The memories are the prime reason for persona's friend being unforgettable, a common human nature is that we remember the happy times and the time we spent with our childhood friends giving us nice memories, the same goes for persona as they have climbed hillsides, played with flowers and many more memorable things, all these together make them unforgettable. 

In the first version of the poem, the dashes connect different sections, perhaps to reflect that the events or images described are taking place in quick succession. The dashes might also signify abrupt shifts of thought or the unpredictability of human life.

The version with the dashes seems to have an uneven rhythm, with pauses and breaks; the version with commas, semicolons, and periods lacks this effect, and it sounds flatter than the other version.

In the revised version, the poem ends with a period instead of a dash, again changing the interpretation of the poem: the dash suggests that something is to follow, while a period suggests closure or finality.

Dickinson also capitalizes seemingly minor words, such as Recess, Ring, and Gown. Perhaps she uses this form of capitalization to emphasize the words' symbolic significance or the images they create. When the capitals are removed, the symbolism in the poem seems weaker.