The London mayoral hustings was suspended for 20 minutes when Andreas Michli, an independent mayoral candidate, repeatedly shouted out the names of murdered teenagers.
New figures show the number of back-office staff working on finance, research and local projects has almost doubled on Labour mayor Sadiq Khan's watch.
Ms Hall has suggested that if elected she will update Transport for London's (TfL) conditions of carriage to include a ban on people playing loud music.