Group 1 - Common errors include confusing service items that do not belong to advertising/entertainment services, leading to overpayment of cultural industry development fees [4] - Advertising services are defined as activities that promote clients' goods or services through various media, while advertising design, planning, and consulting do not fall under this category [5] - Entertainment services are defined as providing venues and services for entertainment activities, but filming movies or TV shows does not qualify as entertainment services [5] Group 2 - A common mistake is equating billing sales with the taxable basis for value-added tax (VAT), resulting in underpayment of cultural industry development fees [6] - The taxable basis for VAT is the non-taxable sales revenue, while the billing sales amount is inclusive of tax [7] - Exemptions for cultural industry development fees include entities that do not reach the VAT threshold and small-scale taxpayers with monthly sales not exceeding 20,000 yuan [8]