Enter the extras menu then go to the password input screen and enter the following codes.

Password	Effect
2GK562	Mutt
2UJQWC	Mannequin: Child Male
2W8QR3	Indiana Jones: Disguised
3FQFKS	Indiana Jones: Officer
3PG5EL	Mannequin: Child Female
4C5AKH	Professor Henry Jones
7AWX3J	Lao Che
7EQF47	Boxer
82RMC2	Mola Ram
8BDJG5	Indiana Jones: CS
94RUAJ	Willie: Singer
DZFY9S	Indiana Jones: Collect
E88YRP	Salah
FGLKYS	Indiana Jones: 2
FTL48S	Rene Belloq
J2XS97	Indiana Jones: Kali
M4C34K	Indiana Jones: Desert
P4PCDY	Mac
PGWSEA	Indiana Jones: 1
QPWDMM	Mannequin: Adult Male
QUNZUT	Indiana Jones: DJ
U7SMVK	Mannequin: Adult Female
WL4T6N	Dovchenko