potential sources of reads in intergenic regions in an RNAseq library

Question

[Rob]

Hi friends

a question: Describe potential sources of reads in intergenic regions in an RNAseq library?

my answer:

sequencing error, mapping error, unannotated genes is it complete answer?

is it a correct answer?

[ATpoint]

Transcription of regulatory elements such as enhancers (enhancerRNA), contamination with genomic DNA.

[Rob]

Thanks ATpoint