The voice recorder has voices of many passengers. Aircraft have two flight recorders, one for flight data, and one for cockpit (more correctly flight deck) voice. The passengers' voices should not be heard.
When Kendra shows Tark his offshore bank account statement showing the £200Million supposedly paid to him by Bartok, the balance on the transaction line shows as £200,15,876.69 instead of £200,015,876.69. This missing zero is shown in the subsequent transaction lines.