Only a few episodes have commentary on the original bluray. They are:
S01E02 On Leather Wings
S01E03 Heart of Ice
S01E35 Almost Got 'Im
S01E40 Heart of Steel (2)
S01E47 Harley and Ivy
S01E51 Robin's Reckoning (1)
S01E59 Read My Lips


General
Unique ID : 316884600705154245204514482320378294376 (0xEE65C10F67E712F3D6E57675022DF068)
Complete name : Batman.The.Animated.Series.S01E02.On.Leather.Wings.1080p.BluRay.FLAC.x264-BTN.mkv
Format : Matroska
Format version : Version 4
File size : 954 MiB
Duration : 22 min 28 s
Overall bit rate mode : Variable
Overall bit rate : 5 939 kb/s
Movie name : On Leather Wings
Encoded date : UTC 2020-07-30 19:09:26
Writing application : mkvmerge v48.0.0 ('Fortress Around Your Heart') 64-bit
Writing library : libebml v1.4.0 + libmatroska v1.6.0 / Lavf58.29.100

Video
ID : 1
Format : AVC
Format/Info : Advanced Video Codec
Format profile : High@L4.1
Format settings : CABAC / 5 Ref Frames
Format settings, CABAC : Yes
Format settings, ReFrames : 5 frames
Codec ID : V_MPEG4/ISO/AVC
Duration : 22 min 28 s
Bit rate : 4 787 kb/s
Width : 1 440 pixels
Height : 1 080 pixels
Display aspect ratio : 4:3
Frame rate mode : Constant
Frame rate : 23.976 (24000/1001) FPS
Color space : YUV
Chroma subsampling : 4:2:0
Bit depth : 8 bits
Scan type : Progressive
Bits/(Pixel*Frame) : 0.128
Stream size : 769 MiB (81%)
Writing library : x264 core 148
Encoding settings : cabac=1 / ref=5 / deblock=1:0:0 / analyse=0x3:0x133 / me=umh / subme=9 / psy=1 / psy_rd=0.70:0.00 / mixed_ref=1 / me_range=24 / chroma_me=1 / trellis=2 / 8x8dct=1 / cqm=0 / deadzone=21,11 / fast_pskip=0 / chroma_qp_offset=-2 / threads=12 / lookahead_threads=2 / sliced_threads=0 / nr=0 / decimate=1 / interlaced=0 / bluray_compat=0 / constrained_intra=0 / bframes=7 / b_pyramid=2 / b_adapt=2 / b_bias=0 / direct=3 / weightb=1 / open_gop=0 / weightp=2 / keyint=240 / keyint_min=24 / scenecut=40 / intra_refresh=0 / rc_lookahead=50 / rc=crf / mbtree=1 / crf=16.0 / qcomp=0.60 / qpmin=0 / qpmax=69 / qpstep=4 / vbv_maxrate=62500 / vbv_bufsize=78125 / crf_max=0.0 / nal_hrd=none / filler=0 / ip_ratio=1.40 / aq=1:0.60
Default : Yes
Forced : No
Color range : Limited
Color primaries : BT.709
Transfer characteristics : BT.709
Matrix coefficients : BT.709

Audio #1
ID : 2
Format : FLAC
Format/Info : Free Lossless Audio Codec
Codec ID : A_FLAC
Duration : 22 min 27 s
Bit rate mode : Variable
Bit rate : 613 kb/s
Channel(s) : 2 channels
Channel layout : L R
Sampling rate : 48.0 kHz
Frame rate : 10.417 FPS (4608 SPF)
Bit depth : 16 bits
Compression mode : Lossless
Stream size : 98.5 MiB (10%)
Title : Stereo
Language : English
Default : Yes
Forced : No

Audio #2
ID : 3
Format : FLAC
Format/Info : Free Lossless Audio Codec
Codec ID : A_FLAC
Duration : 22 min 28 s
Bit rate mode : Variable
Bit rate : 537 kb/s
Channel(s) : 2 channels
Channel layout : L R
Sampling rate : 48.0 kHz
Frame rate : 10.417 FPS (4608 SPF)
Bit depth : 16 bits
Compression mode : Lossless
Stream size : 86.2 MiB (9%)
Title : Stereo
Language : English
Default : No
Forced : No

Text
ID : 4
Format : UTF-8
Codec ID : S_TEXT/UTF8
Codec ID/Info : UTF-8 Plain Text
Duration : 22 min 15 s
Bit rate : 49 b/s
Count of elements : 272
Stream size : 8.00 KiB (0%)
Language : English
Default : Yes
Forced : No

Menu
00:00:00.000 : :Chapter 1
00:01:04.523 : :Chapter 2
00:07:17.145 : :Chapter 3
00:15:15.790 : :Chapter 4
00:21:56.524 : :Chapter 5