Intervocalic /p, t, k/ are realized as voiced [b, d, ɡ]. This feature appeared in this dialect in the 20th century.
A uvular [ʀ] realization of /r/ was established in Arendal before the 20th century.
/ʀ/ is frequently dropped, so that e.g. Lars becomes Læs.
The ending ⟨–er⟩ is pronounced [ɔ], so that the word for 'basement' is kjeller in Bokmål, but kjellå in the Arendal dialect.
According to the linguist Gjert Kristoffersen, a recent change is that the postvocalic /ʀ/ is vocalized to [æ̯], rather than dropped. The phonetic diphthongs [ʉæ̯] and [uæ̯] may be monophthongized and lowered to, respectively, [œː] and [ɔː], so that the words for 'to do gymnastics' and 'thorn' (which phonemically are, respectively, /²tʉʀne/ and /²tuʀne/) vary in their phonetic realization between, respectively, [²tʉæ̯nə ~ ²tœːnə] and [²tuæ̯nə ~ ²tɔːnə]. This process may be extended to mid vowels.