Well I can see some things I’d change. Will they make a difference? i don’t know, probably not, but again, they’re what I use.
(I wish the search function here was half decent so I could find the post I went into this in detail in…)
1) Get your authentication Keys from https://api.wordpress.org/secret-key/1.1/bbpress/salt/
2) Copy your WordPress authentications into your bbPrefig file
define('AUTH_KEY', '5G#If&OQrV:MfrjuU2;NKhfw|Z:|iU>@hw^LLTxv|~8KPC9S;-+r#J&|T=DS%#X8');
define('SECURE_AUTH_KEY', 'u.p|C]A*s*@M%VGr4;_Cc-*d|I:QjTT&p6kcTL:^X+tzUT)7k-S]h)q^c|||$uy;');
define('LOGGED_IN_KEY', 'xA+j,OZKD_*, 6|Jb7C6rS*3(oT4{-Y)R.E/|!xNtb8,GYzp,X-?i[HtTRE|81h=');
define('NONCE_KEY', '4h035-4lx6-W.>dtZzRtA=XA+&G5v)llX[B>4--:>hX0h:Ey$afw|&[r_1zHQnZ^');
define('AUTH_SALT', '+/poE0c>eRr#l54-r@:S.4HD^s3Zr%w-S;s++d,[ku5#Aj{N6g6T;.P>/UB8bIUn');
define('SECURE_AUTH_SALT', 'ck.^(0_T5tON$lTy>dkPZ#]1wZ~yKBkE0m>60H_FRG r6yXd#E|dhJAVvPDu5Kf.');
define('LOGGED_IN_SALT', 'Fz^)*aj<U[RxO3A][1K=pXX6a-4-<R7=[fe$1[hT5d!e-_onpNrk^t|j%!~a+;KP');
define('NONCE_SALT', 'TEdXdR+g]&YY9/YtZX^[,e{_U+^fSGcgt JqKB<[sh:3Jg<7RG~f_.xLX(9e5FXV');
define('BB_AUTH_KEY', 'f@X, B|4rcQ?sv#[]q+x;r =KO{r}i<|h%0=?>!/f|0A#[qzh9pNWdnZR8XadkFH');
define('BB_SECURE_AUTH_KEY', 'X0*%@*wpp(A[/(4RD(TWAnW7N[:gYBZ:@r}-z;w),|fptIbt5 Ro}8Tr?}-c-y+m');
define('BB_LOGGED_IN_KEY', 'cbal+zxea.]|C!ZsWQ6}cKy+?!eSs?@(t)qCz=H*4CDrZlXoC+-X#[h5Hl37LU~/');
define('BB_NONCE_KEY', '4{ZC+__k{]MPr[I{~q$Muta#XghduMPBRQvNZqFIm-~-4-DaH|vH$6W~)wD!^92X');
define('BB_AUTH_SALT', '?v&+?5?vnXoIPuc&%OQMNN#QP_Xf&ZA0J:FO;tY:JdEjT5xt^k$,-q!XvVS,E)$1');
define('BB_SECURE_AUTH_SALT', 'n(M15M~Y<qg(A!x8ov,7]:+HZ>q0ajV3!feD){dLPhn2upN?;fIRE.@~14xH?v!8');
define('BB_LOGGED_IN_SALT', '{Lu=[hq;BCEu j>n[Ejv%]w-k y?$@*sK@VcB<7E)wR/mrUIGj%9@*Q>.v]P|~#x');
define('BB_NONCE_SALT', '*9Dv~}=@+k<g-w$WIsEXdxULL0yz0D{]!9@HY/e$7Ru|^dv?QF$gy!}dcLIC>@5P');
3. With no disrespect to that screencast, it is 19 months old, and we’ve had a whole new version of bbPress since then. For integration I always use http://wpbbpthemes.org/integration/ as a starting guide.
4. Check you’re not using “www” anywhere in the URLS you specify in the database, or that you installed any of the bbPress/WordPress systems while using “www”.